The document summarizes steps taken to purify a fluorescent protein tag from a cyanobacteriochrome found in Thermosynechococcus elongatus, including: 1) Transforming E. coli with the gene for the cyanobacteriochrome tag and inducing protein expression. 2) Lysing the cells using a microfluidizer and centrifuging to remove cell debris. 3) Purifying the fluorescent tag protein using a chitin bead column. 4) Analyzing purity using SDS-PAGE gel electrophoresis and a spectrophotometer.