PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
10636871-4	2000	Biochemical ATPase assays demonstrated a large sodium-independent ATPase activity at pH 6.0 for the pump carrying the TM4 substitutions, whereas the control constructs exhibited little or no activity in the absence of sodium.	Sodium	47-53	tropomyosin 4 S homeolog	Xenopus laevis	118-121