deletions | additions       diff --git a/Cell cycle.tex b/Cell cycle.tex  index 7d120ae..83fcd44 100644  --- a/Cell cycle.tex  +++ b/Cell cycle.tex 
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Explain how we do it for the cell cycle, with some Fucci validation.  $x = 5$ \begin{align*}   \textrm{d}\phi_t =& \frac{2\pi}{T_2}\textrm{d}t + \sigma_{\phi}\textrm{d}W_t\\  \textrm{d}\alpha_t =& -\gamma_{\alpha} (\alpha_t-\mu_{\alpha}) \textrm{d}t + \sigma_{\alpha}\textrm{d}W_t\\  \end{align*}  The model links the observed cell area $a_t$ to the cell cycle phase $\theta_t$ through a waveform $w(\theta)$ and an amplitude $\exp(\alpha_t)$.