( 1 ) in 26 tubules ( 14 rats ) , nephron glomerular filtration rate ( sngfr ) was varied from 37.2 +/- 7.3 to 20.4 +/- 7.1 nl/min by microperfusing their loops of henle at 0 to 5 nl/min and 40 nl/min , respectively .
C0027713
nephron
C0023986
loops of henle