Abstract
1. Ribonucleoprotein was isolated from the silkgland of silkworm (Bombyx mori, L.) in the 5th day of the 5th instar.
2. The amino acid composition of the ribonucleoprotein was analyzed by chemical or quantitative paperchromatographical methods, and compared with that of silk fibroin.
3. Little similarity between the amino acid compositions of the two proteins was observed.
4. N-Terminal amino acid residues of the ribonucleoprotein were shown qualitatively to be occupied by glycine, alanine and serine, and this is similar to fibroin.
