This family consists of a series of primate specific nuclear pore complex interacting protein (NPIP) sequences. The function of this family is unknown but is well conserved from African apes to humans [1].

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4: The evolution of human segmental duplications and the core duplicon hypothesis. Marques-Bonet T, Eichler EE; Cold Spring Harb Symp Quant Biol. 2009;74:355-362. PMID:19717539

5: New and novel intrinsic host repressive factors against HIV-1: PAF1 complex, HERC5 and others. Tyagi M, Kashanchi F; Retrovirology. 2012;9:19. PMID:22405323