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Ammonia and urea fluxes in Potamotrygon sp. , a freshwater stingray of the Amazon

Urea excretion in the Erythrinidae Hoplias malabaricus (Traira), a tropical fresh water teleost fish

The effects of plasma acid-base status on urea excretion in Nile tilapia

Use of Urine in Snow to Indicate Condition of Wolves

Urinary 3-Methylhistidine and Progressive Winter Undernutrition in White-Tailed Deer