At some point early in the vertebrate lineage. two whole genome duplication events (1R. 2R) took place that allowed for the diversification and sub-/neo-functionalization of the glycoprotein hormones (GpHs). All jawed vertebrates possess the GpHs luteinizing hormone (LH). https://www.allfixelectricales.shop/product-category/dryer-fan-pulley/