SUBJECT INDEX 



IOI3 



primitive streak stage in rat embryo, 364 



proamniotic crescent in gastrula, 324 



Procerastea, 593 



Procerodes, 642 



pro-collagenous fibers, 694 



Procotyla, 591 



proctodeum, 469 



productive phase of wound healing, 697 



pro-encephahc structures, development, 520 



progesterone, 12 



prognathism, 245 



proliferation and differentiation, 



antagonism between , 2 1 1 



-, relationship of in early 



embryogenesis, 524 

 — , senescent — of duct cells, 965 

 proline, 1 1 , 78 



— concentration in lymphosarcoma, 896 

 — , conversion of glutamic acid to — , 79 

 — -, ornithine as — precursor in mammals, 



fungi and bacteria, 78 

 promoting agents in carcinogenesis, 858 

 pronephros, 343, 350 

 pronephric duct activating mesonephric 



blastema, 466 

 pronucleus, female, 287 

 pro-oxidants, 618 

 1, 2-propanediol- 1 -phosphate, 889 

 prophase, accumulation in lysine 



deficient medium, 936 



— arrest in Viciafaba roots by 

 2,6-diaminopurine, 932 



propionyl-CoA, 36, 42 

 propyl-thiouracil, induction of pituitary 



tumors by — , 825 

 PRPP reactions, 36, 96 

 prosencephalic differentiation tendencies, 



liberation of , 391 



prosencephalon, 393 



prostatic hormone responsivity of human — 



and mammary cancers, 842 

 promotor and inhibitor in regeneration, 



nature of, 638 

 protagonist, contact between the — tissues, 



474 

 protamines, 298 

 protease activity in amphibian gastrula, 



348 

 proteases, intracellular, 611 



protective agent, role of auxin as , 797 



proteinases, intracellular, 506 



protein, anabolism in nucleus, 297 



— , changes in — and RNA content relatively 



to DNA content during gastrulation in 



Rana pipiens, 362 

 — , compositional differences between — 



components of normal and neoplastic 

 tissues, 896 

 protein extracts as inductors, 434 



— formation in Ehrlich carcinoma cells, 

 887 



in microsomes and mitochondria, 512 



, nucleo-cytoplasmatic interactions 



related to , 514 



, qualitative aspects of in em- 

 bryonic cells, 522 



, stimulating effect of light on 



in isolated chloroplasts, 799 



— forming system, see PFS 



— forming system of developing cells, 495 



— metabolism, remote control of nucleus 

 on , 297 



in tumor tissues, 897 



— precursors, larger than amino acids, 497 



, pathways of utilization, 505 



, utilization of in the differenti- 

 ating cell, 497 



— sparing effect of carbohydrates, 222 



— synthesis, energy requirements, 149 

 , gastrulation as initial stage of new 



286 



, harmonization between — — and 



degeneration, 166 

 inhibited by fluorphenyl alanines, 



[i-3-thienylalanine and ethionine, 937 



, inhibition of by nucleases, 278 



, inhibition of — — in ribonuclease- 



treated roots, 280 

 , linkage of and RNA synthesis 



during spermatogenesis, 273 



, mechanisms, 284 



in microsomes, 26, 123, 290 



, necessity of nucleoprotein synthesis 



for ■, 276 



and nitrogen metabolism, 728 



in plant root cells during elongation, 



791 



, and RNA, 272 



, role of the cell nucleus in , 295 



, stimulation of with testosterone 



in seminal glands of rats, 273 

 , utilization of ammonia for , 222 



— turnover, 148, 165, 222 



— utilization in pregastrula embryos, 736 

 proteins and amino acids in tumor 



tissues, 896 

 — , contractible, 341 

 — , formation of — and enzymes in plant 



cells, 790 

 — , incorporation of methionine into — , 296 

 — , mechanism of formation of specific — , 



284 



