in spite of the presence of some factors unfavorable for the study of human tumors through xenotransplantation , it has , nevertheless , been clearly shown that the nude mouse/human tumor system is a very useful tool for functional analysis of tumors in relation to growth , differentiation , and morphology , such as eutopic or ectopic production of various hormones , afp , normal serum proteins , colony-stimulating factor , erythropoietin , and so on .
C0009392
colony-stimulating factor
C0014822
erythropoietin