PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15721167-1 2005 The widely-used N-methyl-D-aspartate (NMDA) receptor antagonists (R)-4-(3-phosphonopropyl) piperazine-2-carboxylic acid ((R)-CPP) and (R)-2-amino-7-phosphonoheptanoate ((R)-AP7) are frequently used as general NMDA receptor antagonists and assumed not to display significant selectivity among NMDA receptor NR2 subunits. 2-amino-7-phosphonoheptanoic acid 169-176 glutamate ionotropic receptor NMDA type subunit 1 L homeolog Xenopus laevis 16-52