Amino acid analysis of another heptapeptide gave Asp (is released by ac...

Amino acid analysis of another heptapeptide gave Asp

(is released by acid hydrolysis of N and/or Q amides.)

c. Brief chymotrypsin treatment yielded several products, including a dipeptide and a tetrapeptide. The amino acid composition of the tetrapeptide was Glx, Leu, Lvs, and Met.

d. Cyanogen bromide treatment yielded a tetrapeptide that had a net positive charge at pH 7 and a tripeptide that had a zero net charge at pH 7.

What is the amino acid sequence of this heptapeptide?