| A: | Ac-(Pro-Hyp-Gly)7(Asp-Asp-Gly)3-NH2 | C-terminal |
| B: | Ac-(Pro-Hyp-Gly)3(Asp-Asp-Gly)3(Pro-Hyp-Gly)4-NH2 | Middle |
| C: | Ac-(Asp-Asp-Gly)3 (Pro-Hyp-Gly)7-NH2 | N-terminal |
| A: | Ac-(Pro-Hyp-Gly)7(Asp-Asp-Gly)3-NH2 | C-terminal |
| B: | Ac-(Pro-Hyp-Gly)3(Asp-Asp-Gly)3(Pro-Hyp-Gly)4-NH2 | Middle |
| C: | Ac-(Asp-Asp-Gly)3 (Pro-Hyp-Gly)7-NH2 | N-terminal |