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Chromosomal localization of the human placental lactogen-growth hormone gene cluster to 17q22-24.

Recombinant plasmid HCS-pBR322 containing a 550-base-pair (bp) insert of cDNA to human placental lactogen (hPL) mRNA was 3H-labeled by nick translation and hybridized in situ to human chromosome preparations in the presence of 10% dextran sulfate. A high percentage of cells (80%) were found to exhibit label on the distal end of the long arm of chromosome 17. Silver grains on this region constituted 25.5% of all labeled sites, allowing assignment of the hPL and growth hormone (hGH) genes, which have over 90% nucleotide homology in their coding sequences, to 17q22-24. A gene copy number experiment showed that both genes are present in approximately three copies per haploid genome.