By A. M. de Vos and others; primary byline and publication details verified on the journal's PubMed record. Science 255(5042), 306–312 (17 January 1992). DOI: doi.org/10.1126/science.1549776
Verified locator: abstract, 2.8-angstrom crystal structure, one hormone molecule with two receptor extracellular domains and distinct binding surfaces. Primary deposited structure: www.rcsb.org/structure/3HHR . The crystallographic complex does not alone establish every step of receptor activation in living cells.