Figure 2

Microcrystallisation of PAS-GAF.

(a) Micrograph of microcrystals produced by direct crystallisation in microcentrifuge tubes, and (b) the microcrystals produced by crushing macrocrystals (inset) with seed beads. (c) Absorption spectra of PAS-GAF in solution (black) and microcrystals (blue). (d) Structure and atom names of the bilverdin cofactor.