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In https://doi.org/10.1016/j.neuron.2018.07.033, Pan et al. use the designation TMC1^delta/delta to describe a mouse strain lacking a functional TMC1 gene. What if any is the different between the delta/delta superscript and a -/- superscript in this context?

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The delta refers to a mutant allele, in this case a cysteine point mutant. The -/- refers to a homozygous null allele, in this case a knockout.

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