A dot blot is widely used to determine the productivity of a given hybridoma. This assay can also be used to screen a fusion or subclone plate for productive hybridoma clones. First, a nitrocellulose membrane is coated with an affinity-purified goat or rabbit anti-mouse immunoglobulin and then incubated with hybridoma tissue culture supernatant. Monoclonal antibodies in the supernatant are then "captured" on the coated nitrocellulose membrane surface and detected by screening with horseradish peroxidase (HRP).
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