Nobumasa Yoshida, Yukihiro Yanai, Lingjing Chen, Yoshihiro Kato, Junzo Hiratsuka, Tatsushi Miwa, Z. Renee Sung, Shigeru Takahashi, EMBRYONIC FLOWER2, a Novel Polycomb Group Protein Homolog, Mediates Shoot Development and Flowering in Arabidopsis, The Plant Cell, Vol. 13, No. 11 (Nov., 2001), pp. 2471-2481
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Yoshida et al. (2001) studied this question.