Cathepsins/antagonists & inhibitors; Cysteine Proteinase Inhibitors/physiology; Pancreatic Elastase/antagonists & inhibitors; Serine Proteinase Inhibitors/physiology; Serpins/physiology; Amino Acid Sequence; Animals; Base Sequence; Binding Sites; Cathepsin L; Cathepsins/metabolism; Cattle; Cloning, Molecular; Cysteine Endopeptidases/metabolism; Cysteine Proteinase Inhibitors/biosynthesis; Cysteine Proteinase Inhibitors/genetics; Cysteine Proteinase Inhibitors/isolation & purification; Humans; Hydrolysis; Molecular Sequence Data; Multiprotein Complexes/chemistry; Multiprotein Complexes/metabolism; Pancreatic Elastase/metabolism; Papain/antagonists & inhibitors; Papain/metabolism; Protein Isoforms/chemistry; Protein Isoforms/physiology; Protein Structure, Tertiary; Recombinant Proteins/biosynthesis; Recombinant Proteins/genetics; Recombinant Proteins/isolation & purification; Sequence Homology, Amino Acid; Serine Proteinase Inhibitors/chemistry; Serpins/biosynthesis; Serpins/genetics; Serpins/isolation & purification; Substrate Specificity