local irradiation of rat abdomen ( 13.5 gy ) caused similar changes in fatty-acid composition of phospholipids in the liver , thymus and brain , that is : ( a ) a decrease in the polyunsaturated fatty acid content in 4 h , ( b ) a hypercompensatory increase in the content of polyunsaturated fatty acids ( excluding thymus ) in 24 h , the ratio between essential fatty acids and their derivatives being changed towards accumulation of the latter , and ( c ) a trend toward normalization in 72 h .
C0006104
brain
C0423896
content