The present invention provides a peptide or protein having a
neovascularization action and containing a basic amino acid cluster
region of .beta.1,6-N-acetylglucosaminyltransferase, a neovascularization
accelerator containing the above-mentioned peptide or protein, a method
of screening an inhibition substance for the above-mentioned peptide or
protein, and a neovascularization inhibitor containing this inhibition
substance.