Above. Superimposition of Gm.phyA(PG)-PCB subunit B (GAF domain, gold) with subunit A (grey) superimposed. Although the more mobile N-terminal section of the “380s” loop is missing (gold dashes), the final triad of the putative NLS (R360-R362) is resolved. Below. Alignment of the “380s” loop region in plant phytochromes (from Mathews et al. 47). sm, Selaginella martensii; cp, Ceratodon purpureus; ac, Adiantum caperis-veneris; atA-D, Arabidopsis thaliana PHYA-D; cpA, Curcurbita pepo PHYA; psA, Pisum sativum PHYA; stA/B, Solanum tuberosum PHYA/B, asA-D, Avena sativa PHYA; osA/B, Oryza sativa PHYA/B; zmA, Zea mais PHYA. The K(R/K)K(R/K) consensus is boxed red.