%0 Journal Article %T Hydra vulgaris exhibits day-night variation in behavior and gene expression levels %A Hiroyuki J. Kanaya %A Taichi Q. Itoh %A Yoshitaka Kobayakawa %J Archive of "Zoological Letters". %D 2019 %R 10.1186/s40851-019-0127-1 %X The online version of this article (10.1186/s40851-019-0127-1) contains supplementary material, which is available to authorized users %K Day¨Cnight variation %K Transcriptome analysis %K Diel cycle genes %K Cnidarians %K Hydra vulgaris %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6407280/