Figure 1. Time-dependent uptake of thiamine by confluent monolayers of ARPE-19 cells.

ARPE-19 cells were incubated at 37°C in Krebs–Ringer solution (pH 7.4) for 0–10 min in the presence of 15 nm (A) and 5 μm (B) thiamine. Values are means ±s.e.m. of n= 3–4 separate uptake determinations. Note, in all figures when not apparent, the error bars are smaller than the symbol.