Abstract
The earliest bacterial fossils date back about 3 billion years. That was a simpler time! Communications between cells were more modest than those required to maintain a multicellular organism and were probably focused on the ability to signal the presence of beneficial substances (food) or deleterious substances (toxins) in the local environment.
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© 2005 Humana Press Inc., Totowa, NJ
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Conn, P.M. (2005). Introduction to Endocrinology. In: Melmed, S., Conn, P.M. (eds) Endocrinology. Humana Press. https://doi.org/10.1007/978-1-59259-829-8_1
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DOI: https://doi.org/10.1007/978-1-59259-829-8_1
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