Abstract
1. 1. The red kangaroo and the grey possum have well-defined sternal patches of pigment. The pigment of the patches adheres to the outside of the hairs. 2. 2. The possum and the tree kangaroo have fluorescent material adhering to the hair, which in the possum is predominantly 3-hydroxyanthranilic acid and in the tree kangaroo is predominantly a mixture of 3-hydroxyanthranilic acid and kynurenine. 3. 3. Cinnabarinic acid has been shown to be a major component of the free pigment of the red kangaroo. 4. 4. The free pigment of the possum has characteristics identical with those of pigments synthesized in vitro from dopa and cysteine. 5. 5. The significance of these observations in relation to the synthesis of hair pigments in mammals is discussed.
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