“Of peptides that strongly inhibit tubulin polymerization (dolastatin 10, dolastatin 10 isomers, segments, … 15, and phomopsin A), only those previously shown to be strong inhibitors of vinblastine binding and nucleotide … inhibited [3H]dolastatin 10 binding and induced tubulin aggregation (dolastatin 10 itself, … isomers of dolastatin 10, and phomopsin A).”