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THE GRAAFIAN FOLLICLES Reignier van Graaf
DEVELOPMENT OF THE CHICKEN IN THE EGG Marcello Malpighi
THE MAMMALIAN EMBRYO Karl Ernst von Baer
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activity amino acids animals appears auxin bacteria bacteriophage base become biological body cause cells changes chemical complete containing cotyledons course culture curvature cytoplasm described determined differentiation direction division effect embryo enzyme evidence example experimental experiments fact factors figure flowering formation four function further gene genetic grow growth half heated important induced influence isolated known later length less light living material means measure medium ment method molecules mutant nature normal nucleic acid nucleus observed obtained occur organism photoperiod plants position possible preparation present problem produce protein proved reaction remain roots saline seasonal seedlings seeds serum shown side SIII similar single specific stage strains structure substance synthesis takes temperature tested threads tion tissue transduction transforming tubes upper various virus whole young