photoactivatable fluorescent proteins
References
 Hoffman RM. The multiple uses of fluorescent proteins to visualize cancer in vivo. Nat Rev Cancer. 2005 Oct;5(10):796-806. PMID: 16195751
 Lukyanov KA, Chudakov DM, Lukyanov S, Verkhusha VV. Innovation: Photoactivatable fluorescent proteins. Nat Rev Mol Cell Biol. 2005 Nov;6(11):885-91. PMID: 16167053