... within fat-body vacuoles, particularly as the dipeptide N - -alanyltyrosine The tyrosine is converted to “dopa” (dihydroxyphenylalanine) which is then decarboxylated forming dopamine, N - -alanyldopamine, ... polysaccharide consisting primarily of N -acetyl-D-glucosamine residues together with a small amount of glucosamine linked in a β1,4 configuration (Figure 11. 4) In other words, chitin is very similar ... secreting the bulk of the cuticle During periods of inactivity, its 355 356 CHAPTER 11 FIGURE 11. 1 Diagrammatic cross-section of mature integument cells are flattened and intercellular boundaries...