The fourth ligand on the Zn(II) ion is a water molecule. The zinc coordination is tetrahedral. The three histidine residues are sometimes referred to as first coordination sphere ligands. This set of ligands is appropriate to give the water ligand the pKa of 6.5, a value where catalysis is most efficient.
Behind Closed Doors  is a country song written by Kenny O'Dell. It was first recorded by Charlie Rich for his 1973 album Behind Closed Doors. The single was Rich's first number-one hit on the country charts, spent 20 weeks on this chart, and was also a crossover hit on the pop charts. Background vocals were provided by The Nashville Edition.
The Real Voices Behind Milli Vanilli Share Their Side Of The Lip Syncing Scandal (VIDEO) own In 1990, pop group Milli Vanilli was stripped of its Grammy award after it was revealed that frontmen Rob Pilatus and Fab Morvan hadn't sung a single note of their hit songs. Meanwhile, the real singers behind the hits watched the group crumble from behind the scenes. Oprah: Where Are They Now? tracked down Milli Vanilli's female backup singers Jodie Rocco and Linda Rocco along with male leads Brad Howell, Charles Shaw and John Davis to hear their side of the story. It was a common practice for producers, singers, musicians, record companies to have somebody else fronting a very good vocalist, Jodie says.