PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
17737622-1	1986	Chemostratigraphic analyses in the Ordovician-Silurian boundary stratotype section, bracketing a major extinction event in the graptolitic shale section at Dob"s Linn, Scotland, show persistently high iridium concentrations of 0.050 to 0.250 parts per billion.	Iridium	201-208	major histocompatibility complex, class II, DO beta	Homo sapiens	156-159