California sea slug
...that the California sea slug is very useful to the study of neurobiology because of its small number of large neurons?
...that the <b id="mwAj0"><a class="mw-redirect" href="./Aplysia_californica" id="mwAj4" rel="mw:WikiLink" title="Aplysia californica">California sea slug</a></b> is very useful to the study of <a class="mw-redirect" href="./Neurobiology" id="mwAj8" rel="mw:WikiLink" title="Neurobiology">neurobiology</a> because of its small number of large <a href="./Neuron" id="mwAkA" rel="mw:WikiLink" title="Neuron">neurons</a>?