yolk bag造句

• After thymus transplantation , the embryo ' s thymus has trunk cell that comes from the embryo ' s yolk bag , embryo liver and marrow , it excretes a great deal of thymus hormone which change lymphocyte into mature t lymphocyte through multiplication and differentiation , then it help to turn b cell into serous cell , the quantity of the serous cell increases , the antibody that it produces also increases , that is the content of iga , igm and igg is increased
  而移制胎儿胸腺后，由于胎儿胸腺内有来自胎儿卵黄囊、胚肝和骨髓的干细胞，并能分泌大量胸腺素，促进淋巴细胞在该处增殖、分化为成熟t淋巴细胞，继而辅助b细胞活化成为浆细胞，浆细胞数量增加，产生的抗体量增加，即igg ， igm ， iga含量增加。