Detection of sulphated carbohydrates in primitive yolk granules of the hen's oocyte.

Application of several staining methods specific for sulphated carbohydrates have indicated the presence of one or more of these macromolecular species in primitive yolk granules of the hen oocyte. The rationale for the various methods used are detailed in the Materials and methods section. Discussion centres on whether the substances taking up stain may be chondroitin sulphates or other sulphated glycosaminoglycans and the possible roles of such molecules in early development.

Transferrin polymorphism and population differences in the genetic variability of chimpanzees.

Genetic divergencies between chimpanzee populations, not only.between Pan panicus and Pan troglodytes but also between different groups of the latter, are revealed by typing of transferrin. In particular, differences in the incidence of polymorphic transferrins occur between the groups formed by subdividing a large captive chimpanzee colony of heterogeneous geographic origins into racial types solely on the basis of morphological traits. Genetic variability is extremely high in one of these groups, intermediate in another, and relatively low in a third, with the pattern of changing frequencies of allelic genes at the T(f) locus following the pattern of geographic distribution of the actual conspecific populations or races for which the groups are named.