We also looked up various genes classically expressed by Schwann cell precursors or Schwann cells and found that Gap43, Fabp7, Mpz, Dhh, Ngfr, Ncam1, and Mbp were all significantly upregulated in the sparse pigment tumors than in the intradermal melanomas, as was Plp1. The gene discussed is NCAM1; the disease is melanoma.