IPD-MHC 2.0: an improved inter-species database for the study of the major histocompatibility complex. - Giuseppe Maccari; James Robinson; Keith Ballingall; Lisbeth A. Guethlein; Unni Grimholt; Jim Kaufman; Chak-Sum Ho; Natasja de Groot; Paul Flicek; Ronald Bontrop; John A. Hammond; Steven G. E. Marsh (Nucleic Acids Res., 2017)