cyclin-dependent kinase inhibitor 2A Pctr1 p19ARF http://identifiers.org/mgd/MGI:104738 p19<ARF> Ink4a/Arf O protein coding gene p16 p16|ARF-INK4a|Arf|INK4a-ARF|p16INK4a|p19ARF|Ink4a/Arf|MTS1|p19<ARF>|Pctr1 MGI:104738 Cdkn2a MTS1 genetic mapping ARF-INK4a - Gene p16INK4a INK4a-ARF Arf