3.4.21.4	Nalpha-4-tosyl-L-arginine methyl ester + H2O	-	Albatrossia pectoralis	Nalpha-4-tosyl-L-arginine + methanol	-	?	412584	
3.4.21.4	insulin + H2O	oxidized and S-aminomethylated B-chain of trypsin. The enzyme hydrolyzes peptide bonds in which the carbonyl group is contributed by Arg, Lys and S-2-aminoethyl-cysteine	Alces alces	?	-	?	36836	
3.4.21.4	N-benzoyl-DL-arginine 4-nitroanilide + H2O	a synthetic trypsin substrate	Anticarsia gemmatalis	N-benzoyl-DL-arginine + 4-nitroaniline	-	?	366907	
3.4.21.4	insulin + H2O	S-sulfonated B-chain of bovine insulin, only the linkages Arg22-Gly23 and Lys29-Ala30 are hydrolyzed	Astacus leptodactylus	?	-	?	36836	
3.4.21.4	Nalpha-benzoyl-DL-arginine 4-nitroanilide + H2O	-	Balistes capriscus	Nalpha-benzoyl-DL-arginine + 4-nitroaniline	-	?	412585	
3.4.21.4	N-alpha-benzoyl-L-arginine ethyl ester + H2O	-	Boops boops	?	-	?	392753	
3.4.21.4	N-benzoyl-DL-arginine 4-nitroanilide + H2O	-	Boops boops	N-benzoyl-DL-arginine + 4-nitroaniline	-	?	366907	
3.4.21.4	acetyl-Ala-Val-(L-alpha-aminobutyryl)-Pro-Arg(NO2)-4-nitroanilide + H2O	-	Bos taurus	?	-	?	365425	
3.4.21.4	acetyl-Ala-Val-(L-alpha-aminobutyryl)-Pro-Arg-4-nitroanilide + H2O	-	Bos taurus	acetyl-Ala-Val-(L-alpha-aminobutyryl)-Pro-Arg + 4-nitroaniline	-	?	452981	
3.4.21.4	acetyl-Ala-Val-(L-alpha-aminobutyryl)-Pro-Har-4-nitroanilide + H2O	-	Bos taurus	acetyl-Ala-Val-(L-alpha-aminobutyryl)-Pro-Har + 4-nitroaniline	-	?	452982