Figure 3 of
Ablonczy, Mol Vis 2000;
Figure 3. Sequence conflict in rat rhodopsin
The figure shows the MS/MS sequence of the first trypsin fragment of CNBr treated rhodopsin fragment 18. The observed mass of this fragment was different from the mass expected from the gene sequence. The sequence confirms that this difference is due to amino acid 320 (the second threonine in the figure) being a threonine not a serine. In the mass spectrum, PA stands for palmityl group. X stands for palmityl cysteine in the sequence. Notice the loss of the palmityl group from the palmityl cysteines. Underlining indicates the observed masses.