If you found this site useful, please cite:

Croote, D., Quake, S.R. Food allergen detection by mass spectrometry: the role of systems biology. npj Syst Biol Appl. 2016 Sep 29; 2:16022.

Milk Protein: Bos d 9 | α-s1-Casein

Empirical Proteotypic Peptide Explorer:

This rose plot enables visualization of proteotypic peptides. Each colored rose petal corresponds to a peptide and is bounded by thin gray petals, which represent tryptic cut sites. The radial magnitude of each peptide corresponds to the number of publications which report it.

Hover over a rose petal with your mouse to see the peptide. Click on a rose petal to see the species specificity of that peptide and add it to your cart.

Sequence - 214 amino acids


UniProt: P02662   IUIS: Bos d 9

Peptide Selector Tool

Explore peptide targets for mass spectrometry by adjusting the selection criteria below. Results from empirical and computational prediction tools have been aggregated for convenience.

Peptide Characteristics:

Minimum length:

Maximum length:

K LLILTCLVAVALARPK H 0 0.237 0.28566
K HQGLPQEVLNENLLR F 14 0.759 0.54854
R FFVAPFPEVFGK E 24 0.622 0.3876
K DIGSESTEDQAMEDIK Q 1 0.498 0.51994
K EDVPSER Y 1 0.181 0.07756
R YLGYLEQLLR L 23 0.382 0.25618
K VPQLEIVPNSAEER L 2 0.792 0.88926
K EGIHAQQK E 1 0.233 0.1783

1 Previous amino acid (^ = Start of protein)

2 Next amino acid ($ = End of protein)

3 Exp. = Number of publications in which this peptide has been reported experimentally

4 ESP = ESP Predictor. Fusaro VA, et al. Nat Botechnol 2009; 27(2): 190-198. doi

5 CONSeQ = CONSeQuence. Eyers CE, et al. Mol Cell Proteomics 2011; 10(11). doi

Underline: Peptide occurs within the first 20 amino acids from the start of the protein. Use caution as the protein may contain a cleaved signaling sequence.

Strike-through: Peptide is present in a protein from another allergen species and is thus nonspecific.