Fig. 5. AR42J cell uptake of oxidized Tyr³-octreotide peptide tracers [¹⁸F]6 and [¹⁸F]7 demonstrating specific uptake in both internalized and total cell associated fractions (=internalized + membrane bound) that was blocked by co-incubation of non-modified octreotide. Intern.; internalized, Membr; membrane bound. The data is presented as mean ± standard deviation of cell uptake (%) from the total added radioactivity. Statistical significance *p < 0.05, **p < 0.005, ***p < 0.001, ****p < 0.0001. (Panel A) Internalized fraction. (Panel B) Cell associated = membrane bound and internalized fractions.