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. © 2005 Humana Press Inc.
CITATION STYLE
Conn, P. M. (2005). Introduction to endocrinology. Endocrinology: Basic and Clinical Principles: Second Edition. Humana Press. https://doi.org/10.1007/978-1-59259-829-8_1
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