PrP106-126 is a fragment of human prion protein that is present in biological samples. It has been shown to act as an agonist at the human FPR2/ALX GPCR.

[D-Ser13]-Somatostatin-14

X-press Tag is an N-terminal leader peptide; this N-terminal peptide contains a polyhistidine sequence, the Xpress epitope (part of bacteriophage T7 gene 10 protein) and an enterokinase cleavage site. Anti-Xpress antibodies recognize the Xpress epitope sequence found in this leader peptide.