Disclosed herein are extracts of blue green algae, such as Aphanizomenonflosaquae, that are enriched for a selectin ligand, such as an L-selectin ligand.Selectin ligands isolated from blue-green algae cells are disclosed herein.Methods are described for isolating these selectin ligands. The purifiedselectin ligands are of use in inducing stem cell mobilization in a subject.Thus, methods for inducing stem cell isolation that include administering atherapeutically effective amount of the extract enriched form the selectinligand, or an isolated selectin ligand, are disclosed herein.
