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An ontology graph showing direct and second-level subclasses (blue arrows) in the whole plant development stage branch in the PO. Both the sporophyte development stage and gametophyte development stage have subclasses describing vegetative, reproductive, dormant, and senescent stages. Every instance of sporophyte development stage and gametophyte development stage is a part of (orange arrows) some life of whole plant, thus making life of whole plant a major hub/node of this graph.
