This invasion is adaptive as it is triggered by environmental fluctuations. Using lineage labeling, in vivo time lapse imaging and scRNA-seq, we discovered highly motile skin-derived cells that invade mature mechanosensory organs of the zebrafish lateral line and differentiate into Neuromast-associated (Nm) ionocytes. ![]() In contrast, fish lateral line HCs are exposed to the fluctuating ionic composition of the aqueous environment. Actively-maintained ionic homeostasis of the mammalian inner ear endolymph is essential for HC function. Mammalian inner ear and fish lateral line sensory hair cells (HCs) detect fluid motion to transduce environmental signals.
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