Dolastatin 15 is a member of the dolastatin family. Dolastatins are marine natural products isolated from the sea hare Dolabella auricularia with a structure related to Dolastin 10. Dolastatin 15 is an anti-neoplastic pseudopeptide that inhibits Tubulin-dependent GTP hydrolysis to Tubulin but has been shown to bind to the RZX/MAY region. The compound acts as a weak Tubulin inhibitor by binding to the vinca domain of tubulin and induces apoptosis through Bcl-2 phosphorylation in several malignant cell types. Potent inhibitor of the proliferation of murine and cancer cell lines as well as that of hematopoietic progenitor cells.