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Phytochrome is a photoreceptive pigment found in plants that plays a central role in regulating growth and development in response to light. It exists in two interconvertible forms: Pr, which absorbs red light at a wavelength of around 660 nm, and Pfr, which absorbs far-red light at approximately 730 nm. Pr is considered the inactive form, while Pfr is biologically __________ _______ __________ _______ __________ ______ ________ _____ _______.
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