[Microsomal protein changes in the brain of hens in ontogeny].

Studies have been made on the peripheral (extracted by 1 M KCl, pH 9.0) and integral (successively extracted by a 1% solution of Triton X-100 and 0.3% solution of sodium dodecyl sulfate) microsomal proteins from the brain of chick embryos beginning from the 8th day of incubation, chicks and adult hens up to 1 year 4 months. Investigation was made of the quantity, fractional composition (by means of polyacrylamide gel electrophoresis) and the rate of incorporation of 14C-lysine. It was found that the content of these membrane proteins and their composition depend on the age of animals. Integral proteins as compared with peripheral ones exhibit higher rate of incorporation of the labeled amino acid, this rate increasing with the age of animals.