Felder RA and Jose PA (2006) Mechanisms of Disease: the role of GRK4 in the etiology of essential hypertension and salt sensitivity Nat Clin Pract Neprol 2: 637–650 doi:10.1038/ncpneph0301

Figure 1 The principal source of renal dopamine is circulating L-DOPA, which is freely filtered by the glomerulus