The presence of histone H1degree in human tissues.

Histone Hidegree was found to be present in a number of human tissues. It constituted 50% of the total 5% perchloric acid-soluble histone in human breast, 35%in thyroid, 12 to 18% in adrenal, and 7% in parathyroid tissues. The quantities of histone Hldegree in these human tissues were large compared with the amounts found in rat liver (8%), calf thymus (0%), and HeLa cells (0%). Although the quantity of histone Hldegree was found to vary from one type of tissue to another, it was essentially constant in normal, hyperplastic, and neoplastic human thyroid tissues.