Figure 4 - full size

Figure 4.
Figure 4. Electrostatic potential mapped onto the molecular surface of (a) human trypsin IV, (b) human trypsin I, (c) rat anionic trypsin and (d) bovine cationic trypsin. The contouring level of electrostatic potential is -18 kT/e (red) and 18 kT/e (blue). The orientation of the molecules is the same as in Figure 1(a).