Summary
The tail was flexed towards the left side of the body in 5.2 and 6.2% of ICR mouse embryos at 10.5 and 11.5 days of gestation respectively. Body weights of these embryos did not differ from their littermates with right-sided tail flexion. The flexion to the left may be an easily detectable parameter of variation in the morphology of mouse embryos at midgestation.
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Endo, A., Sakai, N. The incidence of tail flexion to the left side in mouse embryos. Anat Embryol 176, 133–134 (1987). https://doi.org/10.1007/BF00309761
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DOI: https://doi.org/10.1007/BF00309761