glia-derived nexin SERPINE2 PI-7 protease nexin I PI7 peptidase inhibitor 7 A serpin that is a translation product of the human SERPINE2 gene or a 1:1 ortholog thereof. PN-1 GDN PN1 serine protease-inhibitor 4 Spi4 PR:000014703 protease nexin 1 Category=gene. serpin E2 protein serpin