例句與造句

1. At present , in an attempt to stimulate specific antitumor immunity , experimental models and clinical studies are currently evaluating the potent antigen - presenting capacity of dc combined with single or multiple tumor antigen epitopes . however , there are several problems in utilizing pulsing dc with synthetic immunodominant peptides from identified antigens . 1 ) the potential induction of tolerance ; 2 ) the need to determine the patient ' s hla haplotype , the limitation of therapy to patients whose tumors express defined specific tumor antigens in the context of the correct hla phenotype , the unavailability of peptides for all hla haplotypes ; 3 ) the lack of cd4 help cell - related epitopes for most antigens ; and 4 ) the ctl resulting from such protocols have a good in vitro capacity to kill peptide - pulsed target cells but only a modest capacity to kill tumor cells
2. 用hla單倍型造句挺難的，這是一個(gè)萬(wàn)能造句的方法