TY  - RPRT
TI  - Which came first, MHC class I or class II?
AU  - M F Flajnik
AU  - C Canel
AU  - J Kramer
AU  - M Kasahara
PY  - 1991
DO  - 10.1007/bf00216688
UR  - https://pubmed.ncbi.nlm.nih.gov/2050387/
ID  - 2050387
ER  -