major histocompatibility complexn.（名词）abbr. MHC【缩写】
A group of genes that code for cell-surface histocompatibility antigens and are the principle determinants of tissue type and transplant compatibility.主组织抗原性复合基因：指定细胞表面组织兼容性抗原遗传密码的基因组，是组织类型和移植兼容性的主要决定因素