Dictionary.com
definitions

mutein

[myoo-teen, -tee-in]
noun Biochemistry.
  1. a mutationally altered protein.

Origin of mutein

apparently mut(ation) + (prot)ein
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
mutein in Medicine

mutein

[myōō′tēn′, -tē-ĭn]
n.
  1. A protein arising as a result of a mutation.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.