If human and chimpanzee FADS2 share 100% sequence identity why does only human sebum have sapienic acid?

Leopoldo González Brusi @Leopoldo-Gonzalez-Brusi

01 January 1970 0 322 Report

Delta-6 desaturase (FADS2) is in charge of the synthesis of sapienic acid from palmitic acid in humans.

Sapienic acid is claimed to be present in human, but not other mammals, sebum.

So, why chimpanzees, with an identical FADS2 aminoacidic sequence do not have sapienic acid in their sebum?

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