PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 18393413-1 2008 We report the first measured activation parameters for the additions of CCl2 and CClF to simple alkenes and demonstrate the existence of enthalpic barriers for CCl2 additions to cyclohexene and 1-hexene. Alkenes 96-103 C-C motif chemokine ligand 2 Homo sapiens 72-76