PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 15787563-5 2005 The second photoreaction process is photocyclization of cis-BSF, which occurs to give DP1 decaying with the half lifetime (tau1/2) of 2.8-4.0 micros to produce another DHP-type intermediate (DP2) with an absorption peak at 400 nm in the absence of O2, through [1,9]-hydrogen shift. dhp 168-171 transcription factor Dp-2 Homo sapiens 191-194