Abstract
After discussion from the floor on the mechanism for determining the length of the tail of the T-even bacteriophage, the Chairman E. Kellenberger (Basel) gave the following summing up: The following three mechanisms have been proposed. For none of them does any solid, experimental evidence yet exist. For the sake of simplicity I discuss here only length determination of tubular structures. It is obvious that all three mechanisms are also applicable to size determinations in supramolecular structures of other forms (see discussion in Kellenberger 1969).

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