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The PO is organized in a complex hierarchical structure in which botanical concepts are described by their precise logical definitions and their relationships to one another. 
The Plant Ontology Consortium (POC) is developing a controlled vocabulary (ontology) that describes plant anatomical and morphological structures and growth and developmental stages for all plants. The goal of the POC is to establish a semantic framework for meaningful cross-species queries across gene expression and phenotype datasets from plant genomics and genetics experiments. 
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