EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
A molecular model of estriol, an estrogen sex hormone produced by the placenta during pregnancy that is the acting antagonist to estradiol. Clinically, estriol levels can be used to monitor fetal health during pregnancy. Atoms are colored dark gray (carbon), light gray (hydrogen) and red (oxygen).
Model release not required. Property release not required.