Fibre-fluorescence In Situ Hybridization Unravels Apparently Seven DAZ Genes or Pseudogenes Clustered Within a Y-chromosome Region Frequently Deleted in Azoospermic Males

Abstract
Using the technique of 'fibre-FISH' (fluorescence in situ hybridization), we describe the direct visualization of seven longer DAZ signal stretches and in addition a maximum of four isolated single DAZ signals on Y-chromatin fibres of four different individuals. These seven longer DAZ signal stretches may represent seven DAZ genes or pseudogenes, whereas the single DAZ signals may represent truncated DAZ genes.