This protocol provides a comprehensive description of an established and robust QFWB method, complete with troubleshooting strategies. These often prove difficult to implement due to the requirement of subtle but undocumented procedural amendments. Many “optimized” western blotting methodologies exist and are utilized in different laboratories. The result is a now truly Quantifiable Fluorescence based Western Blot (QFWB) that allows biologists to carry out comparative expression analysis with greater sensitivity and accuracy than ever before. Importantly, the last ten years have seen technical imaging advances coupled with the development of sensitive fluorescent labels which have improved sensitivity and yielded even greater ranges of linear detection. A cursory search of PubMed using the term “western blot” suggests that in excess of two hundred and twenty thousand published manuscripts have made use of this technique by the year 2014. Since then, western blotting methodology has become a common component of the molecular biologists experimental repertoire. The late 1970s saw the first publicly reported use of the western blot, a technique for assessing the presence and relative abundance of specific proteins within complex biological samples.
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