↓from,to→		A	C	G	T	total
A	0.996986	0.000685	0.000884	0.001161	212877996
C	0.000708	0.998351	0.000424	0.000797	268705021
G	0.000775	0.000422	0.998347	0.000716	270573753
T	0.001148	0.000871	0.000689	0.996885	210302557