Las porfirinas son pigmentos producidos por las glándulas de Harder, situadas detrás de los ojos en ratas y otros roedores. Estas secreciones, que suelen observarse como manchas rojizas en ojos, nariz o boca, a menudo generan dudas diagnósticas, ya que pueden confundirse con sangre. Además, es algo que, lógicamente, asusta mucho a los tutores. En condiciones normales, las porfirinas son parte de la fisiología de las ratas. Sin embargo, su sobreproducción puede ser un indicativo de: - Estrés crón
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