Abstract
In tissues in differing states of physiological activity the phospholipid percentage was greater when the tissue was more active. In the corpus luteum of the pig the phospholipid content was about 3 times as great during its active state in ovulation and pregnancy as in the resting state. Cholesterol was not greatly different. Malignant tumors had about 3 times the content of phospholipid and twice the content of cholesterol as benign tumors. Mammary glands (rabbit) at the end of pregnancy had twice the phospholipid content of the resting gland, cholesterol remaining the same.
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