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Specialized ribosomal proteins are expressed in male germ cells in mammals. (A) Locations of RPs and RP-associated protein genes on the human X chromosome. (B) Timeline of mouse spermatogenesis with periods of male sex chromosome inactivation (MSCI) indicated. Times are in days. Colored bars along gene names indicate approximate periods of expression of either the X-linked genes or their homologs in human and mouse male germ cells.
