Table 2.

The optimized criteria of peptide identifications from human liver tissue lysate and human plasma by SFOER with FDR less than 1%

	Charge	Xcorr	ΔCn	Sp	Rsp
liver tissue	1+	1.76	0.061	44.42	3
	2+	2.31	0.199	104	4
	3+	2.41	0.265	276.9	2
plasma	1+	1.88	0.179	238	80
	2+	2.31	0.270	71	2
	3+	2.40	0.319	215.6	1