BMC Plant Biology MS: 1421915305624023 DNA variation in the phenotypically-diverse brown alga Saccharina japonica Evgeniy S. Balakirev, Tatiana N. Krupnova and Francisco J. Ayala Neighbor-joining tree of the concatenate sequence (4,286 bp total) including rbcLS, COI, and ITS of Saccharina japonica morphological forms. Laminaria digita is used as outgroup. The model of substitution: Tamura-Nei plus gamma.