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416 Santora et al.<br />

Fig. 1. Diagrammatic representation of streptavidin or amplified antistreptavidin staining of<br />

nitrocellulose replicas. Electrophoretically transferred proteins were biotinylated on a nitrocellulose<br />

replica depicted here as a strip blot. (A) B, Biotin; SA, streptavidin; HRP, horseradish<br />

peroxidase. (B) Schematic diagram of streptavidin staining method (Subheading 3.1.). Total<br />

protein, shown as individual dark bands, was biotinylated and detected with streptavidin<br />

conjugated to horseradish peroxidase followed by the α-chloronaphthol color reaction. (C)<br />

Schematic diagram of amplified antistreptavidin staining method (Subheading 3.2.). After<br />

electrophoretic transfer and biotinylation, streptavidin binding to biotinylated proteins was<br />

detected with rabbit antistreptavidin followed by goat antirabbit antibody conjugated to<br />

horseradish peroxidase as described in Subheading 3.2.<br />

anti-streptavidin antisera followed by a secondary antibody conjugated to HRP. This<br />

procedure detects

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