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Molecular species composition of human sperm sphingomyelin (n = 70). Values are relative percent of each sphingomyelin (SM) species ± standard deviation. The value in parenthesis represents the amide-bound fatty acid in the SM molecule. The number to the left of the colon represents the number of carbons in the fatty acid and the number to the right of the colon represents the number of double bonds in the fatty acid. ∑ VLC-PUFA-SM = sum of VLC-PUFA-containing sphingomyelin (SM) species
