thale cress ''arabidopsis thaliana'' weedy species mustard family brassicaceae genome hereditary information contained genes species encoded million base pairs dna forming one smallest genomes among flowering plants ''arabidopsis'' first plant genome sequenced sequencing relatively small genomes rice ''oryza sativa'' ''brachypodium distachyon'' made important model species understanding genetics cellular molecular biology cereals grasses monocots generally model plants ''arabidopsis thaliana'' used
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