L1CAM and hereditary spastic paraplegia: In addition to the aforementioned examples in common forms of HSP, a series of iPS cell lines have been derived from patients affected by other, relatively less common forms, including SPG1 [89], SPG10 [98], SPG30 [103], SPG43 [104], SPG56 [106], SPG58 [108], and SPG76 [110].