During which trimester is the developing embryo susceptible to damage that could lead to birth defects due to the fact that there is such a rapid amount of change taking place in the embryo?

Protein and polypeptide sequences can be determined by first partially hydrolyzing the protein or polypeptide followed by amino acid sequencing of the fragment pieces using the chemical degradation process known as edman degradation. determine the sequence of the initial (18-amino acid) polypeptide that produces the following five partial sequences after hydrolysis and edman degradation.