The three chromoproteins, sepiapterin-protein, iso-xanthopterin-protein, and uric acid-protein complexes, were separated and purified from the soluble proteins occurring in the chromogranules in hypodermal cells of silkworm larvae. The procedure of purification is described.
Absorption spectra of the three specific chromoproteins, i.e. proteins which combines with sepiapterin, with isoxanthopterin or with uric acid, are described. An amino acid analysis of those three chromoproteins was carried out and twelve amino acids were detected in each of them. It is a noteworthy fact that the protein combined with uric acid contains a large amount of glycine.
It was observed on the basis of leucocyte cultures that the somatic chromosome number of the wild boar (Sus vittatusleucomystax Major) and the boar-pig hybrids was 38. The chromosome complements of the wild boar, the pig and the boar-pig hybrids were essentially identical with each other both numerically and morphologically. Cytological evidence suggests the fertility of the hybrids.
Chromosome studies carried out in the hare and the rabbit revealed that the former strikingly differs from the latter chromosomally, suggesting no close phylogenetical kinship between them.