Fig. 10.

The alkaline dependence of tyrosyl (300 nm) and tryptophan (345 nm) fluorescence of PTH in aqueous solution (circles) 0.090M KCl, 0.02M lysine and in 4.6 M guanidine-HCl (squares). Excitation at 270 nm at 25 ^∘C. Taken from Edelhoch et al. (1969)