One that induces, especially a substance that is capable of activating transcription from specific genes within a cell.
A part or structure in an embryo that influences the differentiation of another part.
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.