Table 2.

Average size of isochores in the five families of chromosomes 6, 11q, and 21q and in the whole genome

Family	Average size, Mb
	6 + 11q + 21q	Whole genome
L1	1.60	1.47
L2	1.00	0.92
H1	0.80	0.78
H2	0.60	0.70
H3	(0.34)	0.69

The isochore family H3 is underrepresented in chromosomes 6, 11q, and 21q, and its average size is underestimated.