Molecular phylogeny of extant gymnosperms and seed plant evolution: analysis of nuclear 18S rRNA sequences.

@article{Chaw1997MolecularPO,
  title={Molecular phylogeny of extant gymnosperms and seed plant evolution: analysis of nuclear 18S rRNA sequences.},
  author={Shu-Miaw Chaw and Andrey A. Zharkikh and Huang-Mo Sung and Terrence Chi-Kong Lau and W. -H. Li},
  journal={Molecular biology and evolution},
  year={1997},
  volume={14 1},
  pages={
          56-68
        }
}
To study the evolutionary relationships among the four living gymnosperm orders and the interfamilial relationships in each order, a set of 65 nuclear 18S rRNA sequences from ferns, gymnosperms, and angiosperms was analyzed using the neighbor-joining and maximum-parsimony methods. With Selaginella as the outgroup, the analysis strongly indicates that the seed plants form a monophyletic group with the ferns as a sister group. Within the seed plants the angiosperms are clearly a monophyletic… 

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