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Here are the clues. Preceding each clue is the number of letters in the answer.

Clue 1: 12 letters. Phosphatidylethanolamine
Clue 2: 6 letters. phosphatidylserine
Clue 3: 7 letters. Phosphatidylcholine
Clue 4: 8 letters. Phosphatidylglycerol
Clue 5: 8 letters. Phosphatidylinositol