6PY9:
reference: Structural elements that modulate the substrate specificity of plant purple acid phosphatases: Avenues for improved phosphorus acquisition in crops., Feder D, McGeary RP, Mitic N, Lonhienne T, Furtado A, Schulz BL, Henry RJ, Schmidt S, Guddat LW, Schenk G, Plant Sci. 2020 May;294:110445. doi: 10.1016/j.plantsci.2020.110445. Epub 2020, Feb 14. PMID: 32234228

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