The present invention relates to a crystal of ACE protein. The predecoding circuit is disposed to provide predecoding at a speed substantially faster than the predetermined memory access speed of the memory structure, allowing access to a memory cell at least twice during the memory access period, thereby providing dual-port functionality. The coated abrasive particles have an outer layer coating with highly tortuous surface comprising about 5 spikes and have a tortuosity of at least about 1. The board is formed from a first top portion defining the topside and having a substantially flat region on its under side and a second lower portion joined to the first top portion and defining a wall at least substantially bounding a portion of the flat region.