1. c.153.1 YerB-like YerB-like 3 layers: b/b/a; central mixed beta-sheet of 9 strands, order 541329678; strands 3 and 7 are antiparallel to the rest; an unusual "over the other end" connection between strands 3 and 4 2psb d2psba1 A:52-60,64-72,182-191,192-203,292-299