... et al., 19 99) 10 0! Table 13 : Changes to ID2 protocol for expression and purification of ID2 and ID3 mutants 10 3! Table 14 : ID1 & ID2 constructs and their theoretical biochemical ... al., 19 90, Biggs, et al., 19 92, Christy, et al., 19 91, Riechmann, et al., 19 94, Sun, et al., 19 91) The mammalian family consisted of four members, namely ID1, ID2, ID3 and ID4 (Norton, 2000) and ... al., 19 99) 10 4! Table 15 : Changes to ID2 protocol for expression and purification of ID1 and ID3 HLH domains 10 4! ! vi! LIST OF FIGURES Figure 1: Hydrophobic core packing of...