These mice contain an Enhanced Green Fluorescent Protein (EGFP) gene inserted in-frame into the Fmn1 locus. Expression of the EGFP is detected in the cytoplasm and localized along microtubules. This strain serves as a reporter strain, with EGFP expression mimicking endogenous expression patterns. Mice that are homozygous for the transgenic insert are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. This mutant mouse strain may be useful in studies of cytoskeleton regulation, cell motility, and vesicle endocytosis. The Jackson Laboratory 2024, used with permission.