Abstract
1. 1. Exogenous 1-palmitoyl-sn-glycero-3-phosphorylcholine becomes incorporated into the membrane of A. castellanii within 2 min of incubation.
2. 2. Homogenates of A. castellanii are shown to contain phospholipase A activity.
3. 3. The phospholipase A activity is dependent on the population density of the culture.
4. 4. An increased phospholipase A activity in
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