Definition of "simple protein" []

• A protein, such as a globulin or histone, that yields only amino acids upon hydrolysis. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Despite ten million years of evolution with quadrillions of fish under relentless, life-and-death selective pressure, the Antarctic antifreeze protein does not have anything like the sophistication and complexity even of such a simple protein as hemoglobin, let alone that of the stupendous, multiprotein systems that are plentiful in nature."