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SF primary structure from Peypoux et al. (9). Alkyl chain in position 8 and amino acids at positions 2, 4, and 7 are variable depending on isoforms. Structure for the this study: 1Glu(L)Leu(L)Leu(D)Val(L)Asp(L)Leu(D)Leu(L)7-isoC14, MW 1036.34.
