27. A teacher synthesized a peptide and asked his students to describe the amino acid residues in thepeptide. Student A said: "This peptide contains the amino acid residue which might bephosphorylated". Student B said: "This peptide contains the amino acid residue which has 2 chiralcenters". Student C said: "This peptide does not contain the amino acid residue which could becleaved by CNBr'. Student D said: "This peptide does not contain the amino acid residue which couldbe modified with N-linked glycan in glycoproteins. Student E said: "The pI of this peptide is around

7". The sequence of this peptide should be:

(A) ASQHPIMLWG
(B) CVKILVGAEQNR
(C) AVEFFTRDQPHK
(D) AYKLWPIEAGQA
(E) RGDSSERTVVNCA