Cyclic peptides, method for preparing same and use as angiogenesis inhibitor or activator

Cyclopeptide, chosen from the following compounds: P11: cyclo (DPhe-Pro-Gln-lle-Met-Arg-lle-Lys-Pro-His-Gln-Gly-Gln-His-lle-Gly-Glu) SEQ ID NO: 5 P16: cyclo (Arg-lle-Lys-Pro-His-Gln-Gly) SEQ ID NO: 8 P17: cyclo (Pro-Arg-lle-Lys-Pro-His-Gln-Gly) SEQ ID NO: 9 P19 : cyclo (Gln-lle-Met-Arg-Glu-Gly-lle-Lys-Pro-His-Gln-Gly-Gln-His-lle) SEQ ID NO: 10 P20: cyclo (DPhe-Pro-Gln-lle- Met-Arg-lle-Lys-Pro-His-Gln-Gly-Gln-His-Gly lle) SEQ ID NO: 11 P23: cyclo (-DTyr-Pro-Arg-lle-Lys-Pro-His-Gln) SEQ ID NO: 13 P24: cyclo (Gly-Arg-lle-Lys-Pro-His) SEQ ID NO: 25