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стандартный белок stresses
food.serv.	standard protein
pharm.	protein standard (для того, чтобы тестировать точность процедуры электрофореза, напр., Example of use: "Find the best protein standards for SDS-PAGE, western blotting, 2-D electrophoresis, and other applications." (from an online biotech shop) CopperKettle)