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Chromatograms of four novel variants identified in SPAST, SPG11, and B4GALNT1 gene, respectively. (a) The c.1245+5G>A variant in SPAST from family 2. (b) The p. Val1979Ter variant in SPG11 from family 4. (c) The p. Ser475Phe variant in B4GALNT1 from family 3. (d) The c.1002 + 2 T > G variant in B4GALNT1 from family 3.
