Table 1.

The charged amino acid (AA) content of cytoskeleton PPIs and random PPIs from PDB database

AA Type	Mean content of Cytoskeleton PPI	Mean content of Random PPI	P value
			Mann-Whitney Test, I-tailed	Kolmogorov-Smirnov Test, l-tailed
Acidic AA	0.169	0.141	0.118839	0.138833
Glu	0.115	0.078	0.043527	0.004701
Asp	0.054	0.063	0.257816	0.482385
Basic AA	0.188	0.171	0.280319	0.457611
Lys	0.080	0.062	0.088308	0.199456
Arg	0.086	0.078	0.383006	0.175169
His	0.021	0.031	0.192222	0.485181