As Schwann cells can produce a number of these factors, it is important to understand the signals that regulate Schwann cell proliferation, migration and differentiation.

These two hypotheses are not mutually exclusive but rather may work in concert to regulate neuronal migration.

Modification of the extracellular milieu via local shifts in the protease/inhibitor balance may regulate neuronal migration.

Numerous factors have been shown to regulate polydendrocyte proliferation, migration, and differentiation (reviewed in ).

Chemokines, their receptors, and cell adhesion molecules regulate migration of immune cells into inflamed tissue [15,16,17,18].

The mineral cycle is a biogeochemical and ecological process that regulates the flow, distribution, and migration of mineral nutrients across the Earth's surface.

Rho-GTPases are involved in regulating cell morphology (through cytoskeletal organization) and migration (through focal adhesion formation).

More recently, a role has been described for Dock4 as part of the Wnt signalling pathway which regulates cell proliferation and migration.

Europe has regulated legal migration, but has failed to regulate illegal migration, which is what is at issue here.

The Commission, rather than supporting the creation of a special fund or efforts to regulate migration, would therefore encourage new Member States to use the structural funds effectively.