any of the proteins that mediate the transport of various molecules across biological membranes.
Origin of permease
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
An enzyme that promotes the passage of a substance across a cell membrane.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.