??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A chromosomal abnormality consisting from the absence of among the list of copies of chromosome seven in somatic cells. [from NCI]Retinoblastoma is usually a malignant tumor of your creating retina that happens in small children, commonly i