Abstract
The fluid contained within the mycelium of the fungus cultured by the attine ant, Atta texana, contains three proteolytic enzymes. One enzyme is a DFP-sensitive alkaline proteinase; the other two are metal-chelator-sensitive neutral proteinases. These three enzymes are indentical by all criteria examined to the three proteinases previously isolated from the faecal fluid of A. texana. It is concluded that the faecal enzymes of the fungus-growing ants are derived from the mycelial fluid upon which they feed. The basis for the symbiosis between the attine ants and the fungi which they cultivate in their nests is reinterpreted in the context of this finding.
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