... theexception of E95, a stretch of four occluding loop resi-dues from V112 to S115 in the first molecule of cathepsin B; G75 and Q76 in the molecule A of stefinA; and M1 and E78 in the molecule B of stefin ... pairs of superimposedCA atoms of cathepsin B molecules, excluding residues105–125 of the occluding loop, is 0.34 A˚, whereas ther.m.s.d. between all pairs of superimposed CA atoms of stefin ... to the back of the molecule, whereasthe side chain of H111 points upwards and away from the surface. In the complex, two stefin A residues, A49 from the tip of the first binding loop and L73 from...