we have re-examined the hypothesis of tay and straznicky ( '80 ) that the order of cell genesis in the ni and tectum could help establish proper isthmotectal connections , and we find that a timing mechanisms does not explain the two-dimensional topography of the isthmotectal map but that timing may aid in proper mediolateral positioning of isthmotectal axons at the points where they first enter the tectum .
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