Abstract
The earliest bacterial fossil dates back about 3 billion years. This 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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© 1997 Springer Science+Business Media New York
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Conn, P.M. (1997). Introduction to Endocrinology. In: Conn, P.M., Melmed, S. (eds) Endocrinology. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-641-6_1
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DOI: https://doi.org/10.1007/978-1-59259-641-6_1
Publisher Name: Humana Press, Totowa, NJ
Print ISBN: 978-1-4757-5137-6
Online ISBN: 978-1-59259-641-6
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