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Exogenous ATP inhibits root bending. A, Gravity response of the roots of seedlings grown on media containing MS only for 6 d, transferred to a new plate containing MS only (left) or MS + 5 mm ATP (right), and then turned 90° and grown for 2 more d. B, Bending pattern of the roots of plants grown horizontally 2 d after transfer to: a medium containing MS only or a medium containing MS + 5 mm ATP. Arrows show the start position of root tip after the transfer.
