fatty acids from brain glycerophosphatides , which included a high concentration of polyenes such as 20:4 ( n - 6 ) , 22:4 ( n - 6 ) , and 22:6 ( n - 3 ) , were also esterified by the same procedure , and neither artifact formation nor loss of unsaturated acids was observed .
C0006104
brain
C0086045
concentration