Table 1. MHC (RT1) immunogenetics of strain combinations used for heart transplantation to BMT recipients.

strain combinations		MHC gene region
		RT1A class I	RT1B/Dclass II	RT1C/Eclass I
recipient	LEW.1AR2	a	a	u
BM donor	LEW.1AR1	a	u	u
heart donor	LEW.1WR1	u	u	a

Heart graft donor strain (LEW.1WR1) shares the u haplotype in the RT1B/D region with BMC donor strain (LEW.1AR1). It is disparate to BMC donor strain in the MHC class I encoding regions RT1A and RT1C/E. To the recipient strain (LEW1AR2) it is disparate in all MHC antigen complex encoding regions.