Multiple choice Mitosis occurs when lymphocytes of two individuals are mixed ____________. in presence of mitomycin C in presence of anti-CD4 who are identical twins of differing MHC class II haplotype of differing MHC class I but identical MHC class II haplotype Reveal answer Fill a bubble to check yourself D Correct answer Explanation The mixed lymphocyte reaction is used for typing MHC class II polymorphic variants.