Given that muscle fibre regeneration is characterized by a re-capitulation of developmental programmes of gene expression that includes re-expression of the developmental myosin heavy chain isoforms and myogenic regulatory factors [19-22], we also wished to see if there was any evidence of MyHC-IIb expression in post-natal human muscle undergoing regeneration in response to muscular disease. The gene discussed is SLC3A2; the disease is muscular disease.