1. From the Centre for Molecular Biosciences, University of Ulster, Coleraine, Northern Ireland;
2. From the Centre for Molecular Biosciences, University of Ulster, Coleraine, Northern Ireland;2Royal Group Hospitals, Belfast, Northern Ireland; the
3. Public Health Laboratory, Belfast City Hospital, Belfast, Northern Ireland; and
4. From the Centre for Molecular Biosciences, University of Ulster, Coleraine, Northern Ireland;3Public Health Laboratory, Belfast City Hospital, Belfast, Northern Ireland; and
5. Schepens Eye Research Institute, Boston, Massachusetts.