??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.?? ????? ???? ??? ???? ?? ??? ? ?? ???? ??? ? ????. ?? ????? ??? ????? ??? ???? ?? ???? ??????!A chromosomal abnormality consisting of your absence of among the copies of chromosome 7 in somatic cells. [from NCI]Retinoblastoma is often a malignant tumor from the acquiring retina that oc