title: Absence of a prelabor relaxin surge in women.
mesh_terms: D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011863:Radioimmunoassay; D012065:Relaxin / Q000097:blood*
chemical_list: D012065:Relaxin