PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 12761330-4 2003 The majority of mutations that strongly affected proton sensitivity were clustered in the extracellular end of the second transmembrane domain (M3) and adjacent linker leading to the S2 portion of the glycine-binding domain of NR1. Glycine 201-208 glutamate ionotropic receptor NMDA type subunit 1 Homo sapiens 227-230