There was a hierarchical system in neurobiology, and working in invertebrate animals was not looked upon favorably, except in a very special case: the squid giant axon.
神经生物学中有一个等级系统，无脊椎动物的研究不被看好，除了非常特殊的例子：枪乌贼巨大的轴突。
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The book is the first book on the neurobiology, and takes a broad, conceptual, comparative approach, introducing the principles of vertebrate and invertebrate neural function in all sensory systems.