How do you explain why we observe about 100k different proteins in mammals when we only have about 20k protein-coding genes?

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter15: Genomes And Genomics
Section: Chapter Questions
Problem 10QP: What percentage of the DNA in the genome actually corresponds to genes? How much is actually...
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How do you explain why we observe about 100k different proteins in mammals when we only have about 20k protein-coding genes?

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