The stochastic model of Guerriero et al. addresses single-cell behaviour, for the first time in a plant clock model (possibly in any plant gene expression model).
Guerriero, M.L., Pokhilko, A., Fernandez, A.P., Halliday, K.J., Millar, A.J., and Hillston, J. (2011). J R Soc Interface. 9: 744-56.
http://dx.doi.org/10.1098/rsif.2011.0378