In vivo spectral-coded video of immune response to brain damage through 920 nm excitation. The GFP-labelled microglia (525 nm) colored in green and the laser produced fluorescence (593 nm) is colored in red. Field of view: 150 μm×150 μm. For details, see Q. Sun, et al., Biomed. Opt. Express 9, 581-590 (2018).