Assertion: lysosome's enzyme | /r/HasProperty | smith et al.
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text: As further evidence of this role, homozygous progranulin mutations cause a childhood-onset lysosomal storage disorder called neuronal ceroid lipofuscinosis (NCL), while heterozygous mutations trigger a surge in expression of lysosomal enzymes (Smith et al., 2012; Götzl et al., 2014).