The process whose specific outcome is the progression of the glomerular mesangium over time, from its formation to the mature structure. The glomerular mesangium is the thin membrane connective tissue composed of mesangial cells, which helps to support the capillary loops in a renal glomerulus. [GOC:mtg_kidney_jan10]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process