Did the Neuron evolve twice?

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Neurons are fundamental for survival in animals, enabling organisms respond to sensory stimuli, requires sophisticated integration of different functional modules. However, it has been suggested comb jellies may have independently evolved their neurons and nervous system structure. Using the recent developments of single-cell RNA-sequencing and observations that related cell-types are characterized by the shared expression of orthologous genes in my PhD I will clarify if neurons in ctenophores are homologous to the one in bilaterians