PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
18427801-3	2009	We have previously shown that replacement of two conserved residues, K68 and F291, by cysteine residues leads to disulfide cross-linking between neighbouring P2X(1) subunits.	Disulfides	113-122	purinergic receptor P2X, ligand gated ion channel, 1 L homeolog	Xenopus laevis	158-164	
17287520-5	2007	Here we used a disulfide cross-linking approach to identify pairs of residues that are in close proximity within the ATP binding site of the P2X1 homotrimer.	Disulfides	15-24	purinergic receptor P2X, ligand gated ion channel, 1 L homeolog	Xenopus laevis	141-145