> O.k. 20-22 consist only of tip+cen, but still... ups missed some rows 20 = 61342430bp 21 = 129993255bp 22 = 152537259bp from the mouse website: chrY: 15,902,555bp chrX: 166,650,296bp mt: 16,299bp for the other autosomes the size seems to fit - table - karyoview. best, ido