Application of tyramide signal amplification system to immunohistochemistry: a potent method to localize antigens that are not detectable by ordinary method.

Tyramide signal amplification-avidin-biotin complex (TSA-ABC) method is a powerful technique used to detect antigens that are not detectable by ordinary immunohistochemistry. It is worth trying in cases where localization of antigens by the conventional method has failed and antibodies are precious.