PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 17081063-8 2006 It was found that phosphopeptides from tryptic digest of alpha-casein and beta-casein are effectively and specifically trapped on Fe3+-immobilized MCM-41 with few peptides nonspecifically adsorbed. ferric sulfate 130-134 casein alpha s1 Mus musculus 57-69