Fig. 6. Response of class I XOR expressing oocytes to stimulation with different amino acid fractions. Cells expressing the class I receptor XB107 were stimulated with 22 different amino acids (amino acid mix, A), long-chain neutral amino acids (B) and basic amino acids (C). Clear responses are seen in A and B, while the cells did not react to basic amino acids (C) or other amino acid fractions (see text). The concentration of single amino acids was 200µmoll-1 each in all cases. As in Fig.5 the holding potential was +30mV; times of stimuli are indicated by bars.
