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Pulling optical fibers for acute photostimulation. Start with an approximately 4” connectorized fiber (a). Gently heat the fiber around its midpoint over a butane flame, and pull the two ends in opposite directions to stretch the glass and reduce the diameter (b–d). Secure the shaft of the pulled fiber in stainless steel tubing using cyanoacrylate glue (e). Cleave the fiber tip to desired diameter (f). Black arrowheads indicate location of fiber tip
