PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 6688622-6 1983 Ferrochelatase has an apparent molecular weight of approximately 40,000 by both sodium dodecyl sulfate-polyacrylamide gel electrophoresis and column chromatography on Sepharose CL-6B in the presence of 0.5% sodium cholate. Sodium Cholate 207-221 FECH Bos taurus 0-14