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restriction (re-strik´shun)

1. The process with which foreign DNA that has been introduced into a prokaryotic cell becomes ineffective. 2. A limitation.
lactase r. an inherited trait in which there is low lactase activity and thus there is defective lactose intestinal metabolism. Cf. lactase persistence.
MHC r. T helper cells recognize an antigen that is presented with class II major histocompatibility antigens while T cytotoxic cells usually only recognize a processed antigen in conjunction with class I major histocompatibility antigens.


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