??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.?? ????? ???? ??? ???? ?? ??? ? ?? ???? ??? ? ????. ?? ????? ??? ????? ??? ???? ?? ???? ??????!A chromosomal abnormality consisting from the absence of one of the copies of chromosome seven in somatic cells. [from NCI]????? ?????? ?????? ?? ?? ????? ??? ??? ?????. ?? ???? ???? ????. ???