Estimate the pI (isoelectric point) of the peptide sequence Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val.
a) Calculate the individual pI value of each amino acid and find the average pI
b) Use an online tool or database to predict the pI based on the sequence
c) Consult a bioinformatics or proteomics expert for assistance in determining the pI
d) Perform experimental isoelectric focusing to directly measure the pI of the sequence