A confocal micrograph depicting a newborn mouse testis, with macrophages in green and seminiferous tubules—structures that contain sperm-producing cells—in red.© NOUSHINE MOSSADEGH-KELLER AND SÉBASTIEN MAILFERT / CIMLSee N. Mossadegh-Keller et al., “Developmental origin and maintenance of distinct testicular macrophage populations,” The Journal of Experimental Medicinedoi:10.1084/jem.20170829, 2017.

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