PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 11854433-4 2002 Mutations at the critical asparagine residues in the M2 loop of NR1 and NR2B and at a tryptophan residue in M2 of NR2B reduced block by MK-801, memantine, and TB-3-4. Memantine 144-153 glutamate receptor ionotropic, NMDA 2B Xenopus laevis 114-118