Mice that are homozygous for the transgenic insert (founder line 7AC5/EYFP) are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. All tissues from hemizygous animals display fluorescence in all cell types under appropriate lighting conditions. Homozygotes fluoresce with twice the intensity of the hemizygotes. Notable exceptions to this phenotype are erythrocytes and adipocytes in which fluorescence is negligible or absent.<P>Please note, the original publication describing the creation and phenotype of mice harboring the pCX::EFYP transgene (Hadjantonakis 2002 BMC Biotechnol 2002 2:11) describes mice from founder line "YC5/EYFP" and indicates they are available through The Jackson Laboratory as Stock No. 003772. While the 003772 strain is no longer available, the donating investigators report that this Stock No. 005483 strain (from founder line "7AC5/EYFP") was generated from embryonic stem cell clones from the same experiment using the identical pCX::EYFP vector. Although the transgene integrated independently in the two founder lines, the donating investigators report that mice derived from lines YC5/EYFP and 7AC5/EYFP are "phenotypically indistinguishable."

Fluorescence from yellow fluorescent protein is observed in virtually all cell types in all tissues in these transgenic mice.

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