CARDIAC-LOOP FORMATION IN CHICK PLATE 2 
BRADLEY M. PATTEN 
Mes. d.___ 
Cuv. d_ -¢¥® 
yN 29 HOURS 30 HOURS 32 HOURS 38 HOURS 40 HOURS 
9 somites 10 somites 12 somites 16 somites 18 somites 
20 somites 22 somites 
FE 42 HOURS G 44 HOURS 47 HOURS I 53 HOURS 
25 somites 29 somites 
V O.M.M. 
65 HOURS 76 HOURS 100 HOURS 
38 somites 45 somites 
33 somites 
395 
