Comparison among bright green fluorescent proteins in C. elegans.

Green fluorescent proteins (GFPs) are invaluable tools for visualizing cells and proteins across model systems. Efforts have been made to generate brighter fluorescent proteins such as eGFP, GFPnovo2, mNeonGreen, and mStayGold. Here, we generated single-copy knock-in C. elegans strains for these GFP variants and directly compared their brightness and photostability. We confirmed that mStayGold is brighter and more photostable than eGFP, GFPnovo2, and mNeonGreen, suggesting that it may hold advantages over other GFP variants in experiments where brightness and photostability are important factors.