Regarding Deniz Kural's question about references to papers on category theory and biology, Tom Caudell and I have been investigating a semantic theory for neural networks both biological and artificial, cognitive and non-cognitive. We are designing and conducting experiments to test and refine the theory in both neuroscience and cognitive psychology working with colleagues in those disciplines. An initial paper on the theory is M. J. Healy and T. P. Caudell (2006) Ontologies and Worlds in Category Theory: Implications for Neural Systems, Axiomathes, vol. 16, nos. 1-2, pp. 165-214. The only experiment appearing in a publication to date is one on an artificial neural network application, presented at IJCNN 2005 in Montreal (the results were presented also at CT06). Regards, Mike Healy