Abstract
Here we describe how to anesthetize and image Drosophila larvae as to follow 'the life history' of identified synapses and synaptic components. This protocol is sensitive, for example, the distribution of glutamate receptors expressed at physiological levels can be monitored. Typically, 2-20 time points can be recorded in the intact organism. Finally, we discuss how to extract the kinetic information on protein dynamics from two-color fluorescence recovery after photo-bleaching (FRAP) measurements and give advice how to keep the in vivo imager's five arch enemies--limited temporal and spatial resolution, injury of the animal, inactivation of proteins and movement artifacts--in check. While we focus on synapses, as model structure, the protocol can easily be adapted to study other developmental processes such as muscle growth, gut development or tracheal branching.
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