9. b.67.3 Apyrase distorted propeller with an alpha helix inserted between the second and third blades ! 5-bladed beta-propeller consists of five 4-stranded beta-sheet motifs; meander 1s18 d1s18a_ A:145-151,152-158,176-183,191-204,208-221 1s1d d1s1da_ A:145-151,152-158,176-183,191-204,208-221 1s1d d1s1db_ B:145-151,152-158,176-183,191-204,208-221 1s18 d1s18b_ B:145-151,152-158,176-183,191-204,208-221 2h2n d2h2na1 A:145-151,152-158,176-183,192-204,208-221 2h2n d2h2nb1 B:145-151,152-158,176-183,192-204,208-221