Abstract
Identified neurons of Hirudo medicinalis were cultivated on a protein extract of the extracellular matrix (ECM) of the leech. Microscopic patterns of active ECM protein were prepared by UV photolithography using aluminium masks. The shape of the patterns was visualized by a colour pattern formed in a dye-polymer substrate. The neurons were explanted on the root of branched ECM patterns. The patterns guided the outgrowth of neurites along linear lanes and they induced a bifurcation of the neurites under certain conditions. Neurons with a reproducible, regular shape of arborization were obtained within 1-2 days.
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