PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 32435777-2 2020 Herein, we reported a site-specifically labelled small-sized fluorescent pair 7-HC/FlAsH ((7-hydroxycoumarin-4-yl)-ethylglycine/fluorescein arsenical hairpin) for fluorescence lifetime based FRET (fluorescence resonance energy transfer) to reveal conformational differences of Galphai1 (inhibitory G proteins) and Galphas (stimulatory G proteins) upon beta2AR (beta2-adrenergic receptor) coupling. Fluorescein 128-139 adenosine A2a receptor Homo sapiens 352-359