Prenatal events antedating the birth of thoracopagus twins.
D000328:Adult; D004480:Ectromelia / Q000139:chemically induced; D005260:Female; D005855:Germ Layers; D006801:Humans; D007621:Karyotyping; D011247:Pregnancy; D014428:Twins, Conjoined / Q000139:chemically induced / Q000209:etiology*