Down-regulated during leaf senescence. Belongs to the peroxidase family. Was originally thought to be an ascorbate peroxidase (PubMed:12068123, PubMed:16034597). PubMed:19828564 fails to show any peroxidase activity associated with TL29 and demonstrates that TL29 could bind neither heme nor ascorbate. TL29 lacks the heme-binding site, the proton acceptor and the transition state stabilizer, which are conserved features of the ascorbate peroxidase.