20 August 2019 1 4K Report

I am trying to inject MW 10,000 dextran into the orbitofrontal cortex. I am using a 13 microns glass pipette. I am injecting just with a regular syringe and a tubing, which is connected to the pipette. I fixed the brain in PFA, cut on the freezing microtome and I don't see any fluorescence. What could be the problem? Old dextran, need antibodies to amplify the signal or I have to image slides in any special way? Note: I am doing this for the first time! Thank you for your answers.

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