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mishaps hertwigs epithelial root sheath homeobox genes basics histology of nerve nerve periodontics recent advances management of patients on drugs corticosteroids endodontic therapy root canal procedural errors endodontic pindborg tumour okc cyst errors in endo stellate reticulum ectomesenchymal molecular biology of odontogenesis bell stage tooth development hers odontogenesis oral pathology molecular odontogenesis hedgehog genes stratum intermedium ameloblats advanced bell stage bmp molecular basis of tooth development e-m interactions cap stage bud stage