PIF4 phytochrome interacting factor 4 SRL2 phytochrome interacting factor 4 (PIF4); CONTAINS InterPro DOMAIN/s: Helix-loop-helix DNA-binding domain (InterPro:IPR001092), Helix-loop-helix DNA-binding (InterPro:IPR011598); BEST Arabidopsis thaliana protein match is: phytochrome interacting factor 3-like 6 (TAIR:AT3G59060.1); Has 4545 Blast hits to 4539 proteins in 356 species: Archae - 0; Bacteria - 0; Metazoa - 939; Fungi - 192; Plants - 3373; Viruses - 2; Other Eukaryotes - 39 (source: NCBI BLink). AtPIF4 AT2G43010