Figure 1: N form of the globular structure of BSA. Figures (a) and (b) shows a diagram of "ball & sticks" type with negatively ionized groups (COOH) in red and positively ionized groups (R-NH2, for example) in blue. (a) and (b) show a front and back view of the form N. (c) and (d) show a representation of the secondary structures with α-helices and side chains (acidic =red, basic=blue). We notice the relatively homogeneous distribution of potentially positive and negative charges on the molecular surface. Right side of the picture: BSA and surface groups implicated in acid-base interactions. Representations are obtained with Swiss PDB viewer 4.01.