DLK1 and neuroblastoma: The following positional candidates could be identified, located within or very close to the known shortest regions of overlap in neuroblastoma: CASP9 on 1p36; CACNA2D3, TDGF1 and NKTR on 3p21-p22 (SRO (shortest region of overlap) from [16]); IGSF4, APOA1, MLL and RDX on 11q23 [17-19]; and MEG3 and DLK1 on 14q32 [20].