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Today's question of the day:
Phophatidylcholine is present in all of the following EXCEPT for ____.
Phosphatidylcholine is a phospholipid commonly found in cellular membranes, an integral part of membrane bound organelles, such as the endoplasmic reticulum, Golgi apparatus, nucleus, and peroxisome. Proteasome is not membrane bound, so it does not contain such phospholipid.