part of nephron development kidney mesenchyme development nephrogenic mesenchyme development biological_process The biological process whose specific outcome is the progression of a nephrogenic mesenchyme from an initial condition to its mature state. This process begins with the formation of nephrogenic mesenchyme and ends with the mature structure. Nephrogenic mesenchyme is the tissue made up of loosely connected mesenchymal cells in the nephron. 2010-01-25T04:40:44Z GO:0072076 mah