PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
28235784-5	2017	Here, we studied the accessibility of single cysteines substituted along the pre-TM2 and TM2 helix (residues 327-357) of the P2X7R using as readouts (i) the covalent maleimide fluorescence accessibility of the surface-bound P2X7R and (ii) covalent modulation of macroscopic and single-channel currents using extracellularly and intracellularly applied methanethiosulfonate (MTS) reagents.	methanethiosulfonate	352-372	purinergic receptor P2X 7	Homo sapiens	125-130