This very parallel process can be described using a serial process metaphor. The growing points provide a serial locus of control, even though the implementation is in terms of a uniform state machine in each computational particle

(define-growing-point ((poly from-input-contact) Q-id)

(material poly)

(tropism constant Vdd-long Vss-long)

(initialize lifetime 5)

(secrete (poly-short inhibitor) Q-id)

(when (= lifetime 0)

(start-growing-point (poly up) Q-id)

(start-growing-point (poly down) Q-id)

(terminate)))

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