RTRAF and infection: To determine whether mutualistic symbiotic organisms also encode for CLE peptides that assist in infection, a protein search of mycorrhiza (http://genome.jgi.doe.gov/) and rhizobia (Rhizobase; http://genome.microbedb.jp/rhizobase; Fujisawa et al. 2014) species was conducted using CLE domain consensus sequences and also pre-propeptide sequences.