bmdSi86 [LoxN::rps-27p::DHB::GFP::P2A::H2B::mKate2] I. bmdSi86 is a single-copy CRISPR/Cas9-engineered insertion of a codon-optimized CDK sensor (amino acids 994–1087 of human DNA Helicase B (DHB) fused to GFP) co-expressed with his-58 (H2B) fused to two copies of mKate2. Reference: Adikes RC, et al. "Visualizing the metazoan proliferation-terminal differentiation decision in vivo." bioRxiv 2019.12.18.881888