translate English to German: The head groups of the phospholipids found in biological membrane s are phosphatidylcholine ( lecithin ), phosphatidylethanolamine, phosphatidylserine and phosphatidylinositol. These phospholipids are subject to a variety of reactions in the cell: for instance, polar head groups or fatty acid tails can be released from specific phospholipids through enzyme-catalyze hydrolysis to generate second messengers involved in signal transduction .
Sie bilden häufig die Außenseite biologischer Membranen, wobei ihr Kohlenhydrat-Anteil auf der Zellmembran präsentiert wird.