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Table 1 Sizes of the four expansin families in different plants

From: The expansin superfamily

Species EXPA EXPB EXLA EXLB
Last common ancestor 12 2 1 2
Arabidopsis 26 6 3 1
Poplar 27 2 2 4
Rice 34 19 4 1
  1. The number of genes in each family is listed for the three plant species whose genomes have been sequenced. The number of genes in the last common ancestor of monocots and eudicots was estimated from an analysis of the rice and Arabidopsis genomes [7]. Numbers for poplar do not include partial gene fragments and should be taken as minimum estimates given that its genome is incompletely sequenced. EXPA, α-expansin; EXPB, β-expansin; EXLA, expansin-like A; EXLB, expansin-like B.