<prompt> Plasmalogens belong to which group of compounds:PhospholipidSphingolipidsAminosugarsNone of the above  <response>: These compounds constitute as much as 10 of the phospholipids of brain and muscle. Structurally, the plasmalogens resemble phosphatidylethanolamine but possess an ether link on the sn-1 carbon instead of the ester link found in acylglycerols. Ref: Harper 28th edition, chapter 16. 