hpIs157 [glr-1p::YC3.60 + lin-15(+)]. Strong fluorescent marker for inter-neuron/head motor neuron Ca2+ imaging (FRET). Construct includes 5.3 kb glr-1 genomic promoter sequence upstream of the ATG start codon. Reference: Kawano T, et al. Neuron. 2011 Nov 17;72(4):572-86. PMID: 22099460