How many stereogenic centers are there in Lovastatin ( Mevacor® : a cholesterol-lowering drug) ? 
Definitions:
Macula Densa
A group of specialized cells located in the distal convoluted tubule of the kidney, involved in regulating blood pressure and the filtration rate of the kidneys.
NaCl Concentrations
The measure of the amount of sodium chloride, common table salt, dissolved in a given volume of solution, affecting cellular processes and fluid balance.
Mesangial Cells
Specialized cells in the kidneys that help regulate blood flow through the glomeruli and support glomerular capillaries.
Renal Fascia
A layer of connective tissue that encloses the kidneys and adrenal glands, providing protective support.
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