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Description
Sphingomyelin is a type of sphingosine-containing phospholipid (sphingolipid) that is synthesized by the transfer of a phosphocholine residue from a phosphatidylcholine to a ceramide ( Figure 3 )

& Koppers, A

Savica V, Santoro D, Mazzaglia G, et al
This can be one of the causes that leads to male infertility