Table 1

A hypothetical example MSA that illustrates the problem of uneven site conservation.

Sequence/Site

1

2

3

4


I

A

V

A

C

II

A

V

C

D

III

T

Y

D

E

IV

T

Y

E

C


Sites 1 and 2 are truly covarying, while sites 3 and 4 are random and unrelated. However, as sites 3 and 4 have higher entropy values than sites 1 and 2, the resulting mutual information between sites 3 and 4 is also higher than that between sites 1 and 2 (see main text for the calculations).

Yip et al. BMC Biology 2011 9:53   doi:10.1186/1741-7007-9-53

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