The amino acid composition of a fibrosarcoma and its normal homologous tissue in the rat.

be true, it is still uncertain whether or not the pro teins of cancer and homologous normal tissues have the same or different amino acid composi tion. It seemed worth while, therefore, to reinvestigate this problem with the aid of recently developed microbiological methods which have the advantage of high reproducibility, reasonable accuracy and ready applicability to nearly all of the commonly-occurring amino acids. In these studies it is recognized, as stated further by Toen nies, that "identity of one protein fraction (or sev