Table 1.

 Molecular masses and inhibitory constants of the synthetic peptides on furin, kexin and trypsin.

Mutants	M r		K i
	Theoretical	Determined	Furin (m)	Kexin (m)	Trypsin (m)
M0	2259.53	2259.2	2.48 ± 0.05 × 10−6	> 10−5	6.36 ± 1.65 × 10−9
M1	2314.61	2314.5	3.53 ± 0.31 × 10−8	2.58 ± 0.12 × 10−6	> 10−4
M2	2383.72	2383.2	6.21 ± 0.29 × 10−9	1.54 ± 0.04 × 10−6	> 10−4
M3	2339.71	2339.5	3.26 ± 0.02 × 10−9	4.75 ± 0.01 × 10−7	> 10−4
M4	1841.21	1841.6	2.45 ± 0.28 × 10−9	5.60 ± 0.31 × 10−7	> 10−4
M5	1841.21	1841.4	2.43 ± 0.11 × 10−5	3.53 ± 0.03 × 10−7	> 10−4
M6	1855.23	1855.6	4.70 ± 0.06 × 10−8	2.01 ± 0.20 × 10−7	> 10−4