Turbidity assay of lysozyme activity. The lysozyme activity of gp 5* (□), gp 5* mixed with isolated C-term-his (○), hen egg lysozyme standard (▵), and nicked pre-gp5-his (◊) are shown. The activities of 1 μg of protein for the lysozyme proteins were 0.13, 0.12, 0.11, and 0.014, respectively. The assay was carried out as described in Materials and Methods. OD450, optical density at 450 nm.