Summary
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1.
The fluorescent antibody method was used to study the first appearance of delta-crystallin in the lens rudiment of the chicken embryo, in relation to the cell cycle. At the beginning of lens invagination a few cells, with their nuclei in a basal position, displayed fluorescence. The percentage of cells with a positive reaction increased steadily, but it was not until invagination was well underway, about 3 hours after its start, that fluorescence was seen in dividing cells. It was concluded that in this system cell replication and synthesis of specific protein are not mutually exclusive.
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2.
Because the number of hours passing by before the appearance of fluorescent mitoses was about equal to the previously calculated duration of the G-2 phase of the cell cycle it follows that crystallin production becomes detectable in the late S- or early G-2 phase. Observations on the cellular shape, which is a function of cell cycle phase, at the time that cells first reacted with the fluorescent antibodies agree with this interpretation.
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3.
The suggestion is made that the inductive influence of the optic cup on the lens primordium may primarily be exerted during the DNA synthetic phase of the presumptive lens cells.
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Supported by Grant No. EY-01002 (National Eye Institute) from the U.S. Public Health Service and by a Grant-in-Aid No. G-468 from Fight for Sight, Inc., New York City.
Recipient of a Research Career Development Award No. EY-46,406 (National Eye Institute) from the U.S. Public Health Service.
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Zwaan, J. Mitotic activity in the lens rudiment of the chicken embryo before and after the onset of crystallin synthesis. W. Roux' Archiv f. Entwicklungsmechanik 175, 13–25 (1974). https://doi.org/10.1007/BF00573221
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DOI: https://doi.org/10.1007/BF00573221