diff --git a/Plague.g1a b/Plague.g1a
index 60e4d8f..0a4f243 100644
Binary files a/Plague.g1a and b/Plague.g1a differ
diff --git a/assets-fx/bground.png b/assets-fx/bground.png
index 37e9f89..a5187b2 100644
Binary files a/assets-fx/bground.png and b/assets-fx/bground.png differ
diff --git a/assets-fx/dna.png b/assets-fx/dna.png
index 07127be..02cffb0 100644
Binary files a/assets-fx/dna.png and b/assets-fx/dna.png differ
diff --git a/src/core.c b/src/core.c
index ae92f7a..c70e6bc 100644
--- a/src/core.c
+++ b/src/core.c
@@ -9,7 +9,7 @@
 #include "display_engine.h"
 
 
-int next_frame(struct game *current_game)
+int next_frame(struct game *current_game, int *dna_animation)
 {
     for (int i = 0; current_game->planes[i]; i++)
     {
@@ -54,9 +54,12 @@ int next_frame(struct game *current_game)
     int limit_tick = LIMIT_TICK;
     if (current_game->boost) limit_tick = floor(LIMIT_TICK / 10);
 
+
     current_game->time += ENGINE_TICK;
     current_game->total_time += ENGINE_TICK;
 
+    if (!(current_game->time % 150)) *dna_animation = (*dna_animation + 1) % 16;
+
     if (current_game->time > limit_tick)
     {
         // Reset internal clock
@@ -158,7 +161,7 @@ void message(char *msg)
 {
     display_message(msg);
 
-    int key = 0, frame = 1;
+    int key = 0, frame = 0;
 
     static volatile int tick = 1;
     int t = timer_configure(TIMER_ANY, DNA_ANIMATION_TICK*1000, GINT_CALL(callback_tick, &tick));
@@ -172,8 +175,7 @@ void message(char *msg)
         key = rtc_key();
         display_dna_animation(frame);
 
-        frame = (frame + 1) % 24;
-        if (!frame) frame = 24;
+        frame = (frame + 1) % 16;
     }
 
     if (t >= 0) timer_stop(t);
diff --git a/src/core.h b/src/core.h
index a1de721..cd72f77 100644
--- a/src/core.h
+++ b/src/core.h
@@ -90,7 +90,7 @@ struct cursor
 int get_inputs(const int background, int *mutation_menu, int *boost);
 
 // next_frame : compute the plane's positions
-int next_frame(struct game *current_game);
+int next_frame(struct game *current_game, int *dna_animation);
 
 // rtc_key : get the key with RTC system
 int rtc_key(void);
diff --git a/src/display_engine.c b/src/display_engine.c
index 12b7978..c267d96 100644
--- a/src/display_engine.c
+++ b/src/display_engine.c
@@ -12,10 +12,11 @@ void display_background(const int background)
 }
 
 
-void display_foreground(const int background, const struct game *current_game, const int mutation_menu)
+void display_foreground(const int background, const struct game *current_game, const int mutation_menu, const int dna_animation)
 {
     extern const bopti_image_t img_mutations;
     extern const bopti_image_t img_planes;
+    extern const bopti_image_t img_dna;
     extern const uint8_t world[64][128];
 
     GUNUSED int length;
@@ -57,6 +58,9 @@ void display_foreground(const int background, const struct game *current_game, c
                 if (current_game->planes[i]->y + 8 < 57) dsubimage(current_game->planes[i]->x - 4, current_game->planes[i]->y - 4, &img_planes, 0, 8 * (current_game->planes[i]->direction - 1), 8, 8, DIMAGE_NONE);
             }
 
+            // Animated DNA
+            dsubimage(1, 51, &img_dna, dna_animation * 8, 0, 7, 12, DIMAGE_NONE);
+            
             // Status bottom bar 
             int length = 73 * current_game->research / current_game->limit;
             dprint(9, 58, C_BLACK, "%d", current_game->dna);
@@ -196,9 +200,10 @@ void display_message(char *msg)
 
 void display_dna_animation(const int frame)
 {
-    extern bopti_image_t img_dna;
+    extern const bopti_image_t img_dna;
 
-    dsubimage(114, 29, &img_dna, 11 * (frame - 1), 0, 11, 32, DIMAGE_NONE);
+    dsubimage(2, 3, &img_dna, 8 * frame, 0, 7, 12, DIMAGE_NONE);
+    dsubimage(42, 3, &img_dna, 8 * ((frame + 2) % 16), 0, 7, 12, DIMAGE_NONE);
     dupdate();
 }
 
diff --git a/src/display_engine.h b/src/display_engine.h
index a9c314e..5ac0dee 100644
--- a/src/display_engine.h
+++ b/src/display_engine.h
@@ -7,7 +7,7 @@
 void display_background(const int background);
 
 // display_foreground : display the foreground, planes, statistics
-void display_foreground(const int background, const struct game *current_game, const int mutation_menu);
+void display_foreground(const int background, const struct game *current_game, const int mutation_menu, const int dna_animation);
 
 // display_mutation : display the mutation selection screen
 void display_mutation(const int table[4][8], const struct cursor c, const int mutation_menu);
diff --git a/src/epidemic_engine.c b/src/epidemic_engine.c
index e3762ea..5615b17 100644
--- a/src/epidemic_engine.c
+++ b/src/epidemic_engine.c
@@ -42,7 +42,7 @@ void epidemic_simulation(struct game *current_game)
     init_tab(current_game->grid.width * current_game->grid.height, current_grid, current_game->grid.data);
 
     int healed_rate =  0;
-    if (current_game->research == current_game->limit) healed_rate = rand() % 26;
+    if (current_game->research == current_game->limit) healed_rate = rand() % 11;
 
     // Make the epidemic grid evolove
     for (int i = 0; i < current_game->grid.width; i ++)
@@ -97,6 +97,12 @@ void epidemic_simulation(struct game *current_game)
     }
     init_tab(current_game->grid.width * current_game->grid.height, current_game->grid.data, current_grid);
     free(current_grid);
+
+    for (int i = 0; i < 4; i ++)
+    {
+        if (current_game->humans[i] < 0) current_game->humans[i] = 0;
+        else if (current_game->humans[i] > (current_game->grid.width * current_game->grid.height) - BLANK_CASES) current_game->humans[i] = (current_game->grid.width * current_game->grid.height) - BLANK_CASES;
+    }
 }
 
 
diff --git a/src/main.c b/src/main.c
index 44ba069..a04c32f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -97,14 +97,9 @@ static void title_screen(void)
     dupdate();
     sleep_ms(250);
 
-    for (int i = 64; i > 32; i --)
-    {
-        dclear(C_BLACK);
-        dsubimage(0, 0, &img_title, 0, 0, 128, 64, DIMAGE_NONE);
-        dprint_opt(16, i, C_WHITE, C_BLACK, 0, 0, "VERSION %s", VERSION, -1);
-        dupdate();
-        sleep_ms(75);
-    }
+    dsubimage(0, 0, &img_title, 0, 0, 128, 64, DIMAGE_NONE);
+    dprint_opt(32, 29, C_WHITE, C_BLACK, 0, 0, "VERSION %s", VERSION, -1);
+    dupdate();
     sleep_ms(1000);
     
 
@@ -141,7 +136,7 @@ static void title_screen(void)
 int main_loop(struct game *current_game)
 {
     int background = 1, mutation_menu = 4;
-    int end = 0, to_save = 1;
+    int end = 0, to_save = 1, dna_animation = 0;
 
     static volatile int tick = 1;
     int t = timer_configure(TIMER_ANY, ENGINE_TICK*1000, GINT_CALL(callback_tick, &tick));
@@ -156,11 +151,11 @@ int main_loop(struct game *current_game)
         // Update the screen
         dclear(C_WHITE);
         display_background(background);
-        display_foreground(background, current_game, mutation_menu);
+        display_foreground(background, current_game, mutation_menu, dna_animation);
         dupdate();
 
         // Compute the motion of planes, DNA points and infectious model
-        to_save = next_frame(current_game);
+        to_save = next_frame(current_game, &dna_animation);
         if (!to_save) end = 1;
         
         // Get inputs from the keyboard and manage it