Figure 1.

Trigonal crystals of MJ0729 grown by vapour diffusion at 293 K and (a) pH 4.2–4.3 (rocket-shaped rods with a hexagonal base), (b) pH 4.6–4.8 (sharp rods with a hexagonal base) and (c) pH 4.8–5.0 (hexagonal prisms) (approximate dimensions 400 × 400 × 1500 µm). κ = 180° sections of the self-rotation function of the native MJ0729 data sets RAN1, BM2 and ID1 are shown in (d), (e) and (f), respectively. The apparent 321 point-group symmetry observed for data set RAN1 is consistent with both a nontwinned P3₁21/P3₂21 crystal or with an almost perfect hemihedrally twinned P3₁/P3₂ crystal. On the other hand, the apparent 622 point-group symmetry observed for data sets BM2 and ID1 suggests different degrees of hemihedral or tetartohedral twinning, depending on the actual space group (P3₁21/P3₂21 or P3₁/P3₂, respectively). This figure was prepared using MOLREP (Vagin & Teplyakov, 1998 ▶).