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. 2019 Aug 10;19(16):3502. doi: 10.3390/s19163502

Figure 1.

Figure 1

Sensor designs. Diagrams of a bioluminescence resonance energy transfer (BRET)-only sensor (A) or BRET-FRET (Förster-type resonance energy transfer) sensor (B) depict NanoLuc in blue, the B. subtilis ε subunit in grey, an RFP (red fluorescent protein) in red, and either mNeonGreen or mTurquoise2 in green.