| http://www.w3.org/ns/prov#value | - Phenylalanine is a precursor to the first committed step in lignin biosynthesis (Rubery and Northcot, 1968) and may arise under periods of low sink strength due to decreased activity of the phenylalanine ammonia-lyase as has recently been suggested for tobacco (Fritz et al., 2006a, b).
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