Medical Question about the synthesis of fatty acids

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In fatty acid synthesis, a 16-carbon chain is produced after seven cycles of the synthesis process, primarily using acetyl-CoA as the carbon source. However, there is one carbon that does not originate from acetyl-CoA; this carbon is derived from propionyl-CoA in the case of odd-chain fatty acids, such as C15 or C17. This distinction highlights the difference in carbon sources between even- and odd-chain fatty acid synthesis.
samy4408
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Hello , in the course of fatty acids synthesis the professor said that after the repetition of the cycle 7 times we end up with a 16 carbon chain
and he added that all the carbons came from acetyl-COA except for one .
i didn't understand the last one , what is the carbon that don't come from acetyl-COA ?
 
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In even-chained fatty acids, this also is from AcCoA.
In odd-chained (e.g. C15 or C17), however, the initial element is Propionyl-CoA.

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