NF1 and plexiform neurofibroma: Since sNF96.2 cells have been reported to be mutated for NF1, we designed experiments using two other types of Schwann cells not previously reported to be mutated for NF1, namely HSwC (human primary Schwann cells isolated from human spinal nerve) and ipn02.3 2λ (immortalized patient derived plexiform neurofibroma Schwann cells).