Meanwhile, hybrids were distinguished via genes associated with development and so perhaps more MSC-like (e.g., EFNA1, ephrin A1 tyrosine kinase heavily involved in neuronal development; TFAP2C transcription factor AP-2 gamma involved in the activation of several developmental genes) but also with genes associated with the tumor form and function (e.g., MUC1, mucin 1, the aberrant function of which is associated with carcinoma). The gene discussed is EFNA1; the disease is neoplasm.