232 



CULTURING ISOLATED ANLAGEN 



SOMITES 



NEURAL TUBE 



EYE 



HYPOPHYSIS 



AMBLYSTOMA - STAGE 30 



EYE 



HYPOPHYSIS 



^'^'- PRONEPHROS 



NEURAL TUBE 



I 



SUCKER HEART 



TAIL BUD 



/ 



RANA - STAGE 18 - 19 



ANLA6E: TO BE CULTURED AS EXPLAMTS 



