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Affinity Chromatography of Phosphorylated Proteins 289<br />

Fig. 2. Overview of the purification procedure with Clontech’s PMAC Phosphoproteins<br />

Enrichment Kit.<br />

3.1. Extracting Proteins from Cells<br />

1. Wash 50–150 mg of cells three times with 20 vol of phosphate-buffered saline<br />

(PBS) by centrifuging at 500 × g in a pre-weighed centrifuge tube (see Note 2).<br />

2. After washing, centrifuge cells as above and then decant the supernatant and<br />

aspirate the residual liquid.

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