The sympathetic nervous system, which enables the fight-or-flight response, was thought to be present only in jawed vertebrates. Analysis of a jawless vertebrate suggests that this system might be a ...
The adaptive immune system of vertebrates represents a major evolutionary innovation that underpins the capacity for antigen-specific recognition, immunological memory and refined regulation of host ...
v. 1. Propaedeutics to comparative neurology.--v. 2. Invertebrates and origin of vertebrates.--v. 3, pt. 1. Structural elements: biology of nervous tissue.--v. 3, pt ...
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