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I should note that my blog post expresses discomfort with the use of the word "cascade" as a false analogy, and also questions whether we can be sure that we have a "switch" here rather than a knob"

To extract a quote[1]:

"Whether evolution has fashioned digital devices on a large scale is still a matter of debate, but considering that our current technological mind set is digital, we may be inadvertently focusing too much attention on the possibility of a digitally driven biological cell. [...] Given the flexibility of analog and its inherent ability to condense data handling to a far greater degree than its digital counterpart, we think that the argument that evolution has selected largely for analog-based signaling networks is a strong one."

1. Herbert M. Sauroa,b and Boris N. Kholodenko: Quantitative analysis ofsignaling networks, Progress in Biophysics & Molecular Biology 86 (2004) 5–43,
doi:10.1016/j.pbiomolbio.2004.03.002

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