described using 96-well ChemoTx® plates with 5μm pores
(Neuroprobe). Migrating cells were detected by the use of CellTiterGlo®
Dye (Promega) and resulting luminescence measured using a TopCount scintillation
counter (PerkinElmer). In all experiments, each data point was assayed in
duplicate. Data are reported as Chemotactic Indices, defined as the migratory
response to a particular stimulus divided by the migratory response to media
alone.