NIH Record - National Institutes of Health
The two sex chromosomes—X (larger pair) and Y.

April 19, 2019

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The X and the Y chromosomes. The X chromosome is the larger pair.

On the Cover

On the cover: Humans typically have two sex chromosomes­—X (larger pair) and Y. Scientists have evidence that millions of years ago, X and Y were the same size and contained essentially the same genes. Now, virtually the only DNA they still have in common is at the very tips (blue).

Melissa Wilson, Arizona State University

The NIH Record

The NIH Record, founded in 1949, is the biweekly newsletter for employees of the National Institutes of Health.

Published 25 times each year, it comes out on payday Fridays.

Editor: Dana Talesnik
Dana.Talesnik@nih.gov

Associate Editor: Patrick Smith
Pat.Smith@nih.gov

Assistant Editor: Eric Bock
Eric.Bock@nih.gov

Staff Writer: Amber Snyder
Amber.Snyder@nih.gov

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