Table 1.

Condition/Fragment Size	Looping Index
WT 15kb	2.41
WT 23kb	1.64
WT 50kb	0.25
mcd1−1 15kb	1.54
ndc10−1 15kb	1.15
ndc10−1, aF 15kb	1.15
aF 15kb	2.31
aF 23kb	1.67
aF 50kb	1.01
galcen 15kb	1.18
uncrosslinked	1.15

Looping Index for wild-type and mutant strains. The looping index is a measure of the propensity for two regions of chromosome III to interact following crosslinking, restriction digestion and ligation. The looping index is detailed in the text and Suppl. Fig. 3.