ABSTRACT

Please address all correspondence to Quoc C. Vuong, Institute of Neuroscience, Henry

Wellcome Building, Newcastle University, Newcastle upon Tyne, UK. E-mail: quoc.vuong@

newcastle.ac.uk

This work was supported by the National Fund of Scientific Research (FNRS) Belgium

(CM and BR), a PAI/UIAP grant no. P7/33 (Poˆles d’attraction interuniversitaires, Phase 7) to

BR, and a grant from the Hong Kong Research Grants Council (HKU744911) to WGH.