title: The twinning connection.
mesh_terms: D000818:Animals; D005260:Female; D005298:Fertility; D006736:Horses / Q000502:physiology*; D007986:Luteinizing Hormone / Q000097:blood; D010060:Ovulation; D011247:Pregnancy; D011270:Pregnancy, Animal; D011272:Pregnancy, Multiple; D014427:Twins
chemical_list: D007986:Luteinizing Hormone