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Direction and degree of leaf curvature in different leaves. rp-1, rp-2, rp-5, and rp-9 are the four genotypes of heading Chinese cabbage, while rc-1, rc-2, rc-3, and rc-4 are the four genotypes of non-heading Chinese cabbage. Leaf 6 at the far right is the first leaf of the edible parts while leaf 1 at the far left is the inner leaf.
