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protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
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proton pump
pro·ton pump


noun 
Definition:
 
stomach enzyme: the enzyme by which hydrochloric acid is synthesized in the parietal cells of the stomach lining
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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