A limited genomic region contains the human REG and REG-related genes.

A glycoprotein expressed in exocrine pancreas (where it has been called lithostathine) and endocrine pancreas (where it has been called the regeneration protein) is encoded by a gene (REG) which maps to 2p12. A REG-related sequence (REGL) is also located in 2p12 and expressed in the pancreas. Here we describe the physical mapping of these genes within a 100-kb genomic region. A YAC clone was converted into an ordered cosmid contig. We constructed a restriction map of the cosmid contig and localized the loci corresponding to the genes. A third REG-related sequence also maps to this region. Although this sequence was previously described as a pseudogene, we show here that it is also expressed in the pancreas.