Examlex
Meteorites seem to be primarily composed of material very similar to the material in asteroids.
Urethra
The tube that conveys urine from the bladder to the outside of the body in both sexes, and also transports semen in the male reproductive system.
Leydig Cells
Testosterone-producing cells in the testes that react to luteinizing hormone.
Interstitial Cells
Cells located in the testes that produce testosterone, playing a key role in the development of male secondary sexual characteristics.
Testosterone
A primary male sex hormone responsible for the development of male secondary sexual characteristics, though also present in females in smaller amounts.
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