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Leaf soluble protein concentrations of young, expanding (red bars) and fully mature (>1 year old in Proteaceae species; green bars) leaves of six Proteaceae species growing in their natural habitat and in Arabidopsis thaliana grown in a growth room at a range of day lengths, as indicated along the x-axis. Leaves of the Proteaceae species were harvested during mid-morning; those of A. thaliana at the end of the day.
