The biological process whose specific outcome is the progression of a lung-associated mesenchyme from an initial condition to its mature state. This process begins with the formation of lung-associated mesenchyme and ends with the mature structure. Lung-associated mesenchyme is the tissue made up of loosely connected mesenchymal cells in the lung. [GOC:dph, GOC:mtg_lung]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process