Table 1.

The effects of extracellular sodium and external pH on L-citrulline transport

Conditions	L-citrulline transport (% control)
Na+-free	67±5*
pH 5	112±6
pH 6	106±5
pH 8	89±1

Dependency of L-citrulline transport on extracellular sodium or varying pH was examined using either nominally Na⁺-free Krebs or buffers with pH values ranging from 5 to 8. Transport of L-citrulline (0.1 mM) was measured in unstimulated cells over a 10 min period. Data are expressed as a percentage of the influx rate obtained in normal Na⁺-containing Krebs maintained at pH 7.4 (100%=0.31±0.04 pmol μg protein⁻¹ min⁻¹). Values denote the means±s.e.m. of experiments in three different cell cultures with five replicates in each experiment.

^*P<0.05 compared to control.