Tinker Tailor Soldier Spy is a music video.
In biochemistry and molecular biology , a pulse-chase analysis is a method for examining a cellular process occurring over time by successively exposing the cells to a labeled compound -LRB- pulse -RRB- and then to the same compound in an unlabeled form -LRB- chase -RRB- .. Radioactivity is a commonly used label .. Radioactivity. Radioactivity