??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A chromosomal abnormality consisting of your absence of on the list of copies of chromosome 7 in somatic cells. [from NCI]Retinoblastoma is actually a malignant tumor of the building retina that happens in small children, generally in advan