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December 2020 The interdigital gland in crossbred sheep is similar to skin and has specialized structures for secretion.
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December 2025 in “The Journal of Basic and Applied Zoology” Red Sokoto goat fetuses develop firmer, pigmented skin with hair follicles as they grow.
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December 2013 in “Veterinary dermatology” Three dogs with a rare skin condition improved with treatment.
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January 2018 in “Advances in experimental medicine and biology” Hair keratins evolved from ancient proteins, diversifying through gene changes, crucial for forming claws and later hair in mammals.
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November 2011 in “Veterinary pathology” The study found that mouse sweat glands develop before birth, mature after birth, and have specific keratin patterns.
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July 2004 in “Journal of morphology” Marsupial hair structure and keratin distribution are similar to placental mammals.
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January 2025 in “Annals of the New York Academy of Sciences” Spiny mice can regenerate tissues instead of forming scars.
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November 2008 in “Proceedings of the National Academy of Sciences” Reptiles have genes similar to hair proteins, suggesting hair's genetic origins predate mammals.
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December 2024 in “BMC Genomics” Nuptial pads in Chinese brown frogs change seasonally due to specific gene activity.
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July 1999 in “Journal of Anatomy” Methylene blue staining effectively reveals detailed nerve structures in rat snouts.
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March 2004 in “The Journal of Urology” Hypospadiac rats showed abnormal genital development, useful for studying human hypospadias.
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June 1995 in “The Journal of Dermatology” The flaky skin mouse mutation is a natural model for studying human psoriasis.
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February 1991 in “Journal of Biological Chemistry” January 2025 in “Arquivo Brasileiro de Medicina Veterinária e Zootecnia” Agoutis in captivity have more resting (telogen) hairs than growing (anagen) hairs, regardless of season or gender.
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October 2021 in “bioRxiv (Cold Spring Harbor Laboratory)” Lemur hair color and density vary by environment, supporting theories on primate hair evolution.
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February 2025 in “Journal of Anatomy” Gray short-tailed opossums' skin shifts from helping with breathing to regulating body temperature as they grow.
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April 2004 in “Gene expression patterns” The three estrogen receptor genes are highly expressed in zebrafish neuromasts during development.
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June 2007 in “PLoS ONE” Birds can regenerate inner ear cells using specific gene pathways, unlike mammals.