[Normal 17-day human embryo. Qualitative and quantitative characteristics of protein components]

Protein components in the definitive and provisory anlages of the 17-day-old human embryo "Krym" have been studied in a complex investigation. Acidic, basic and summary proteins, nucleoproteids and some amino acids (histidine, arginine and lysine) have been analysed. Quantitative estimation of histones, histone-like and common proteins has been performed by means of the probe spectrophotometer in corresponding wave lengths at the probe size of 1 mkm. It has been demonstrated that in zones of intensified cell proliferation and differentiation contents of the histone-like proteins and nucleoproteids are increased. These zones are presented in the germ shield by the prechordal plate. Hensen's nod and primary streak, and in the chorionic membrane--by the trophoblastic integument and by the wall of the forming blood vessels. Certain asynchronity in differentiation of chorionic villi of various morphological types is also noted, it is one of the most important ontogenetic regularities in the formation of morpho-functional correlations in the system mother-fetus.