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- W2049075540 abstract "This paper proposes that cell division assembles divaricate patterns from alternate states expressed by pigmentation zones in the belt of mantle epithelium which deposits the growing margin of the shell. This model of development derives from two fundamental features of patterns in Lioconcha castrensis (Linné). Its patterns are lineages of standard brown triangular units that double repeatedly and diverge in opposite directions from a common origin over the white surface of the valves. Doubling of pigment, not dilution or subdivision, accounts for patterns, since the width and intensity of the units do not decline, even after long lineages. Hence, cell division is proposed. The second feature concerns the finding that triangular units consist of specific combinations of radial and divergent lines that branch from previous diagonal lines. These lines evidently are deposited by pigmentation zones which assume certain states governing whether they are pigmented and radial or divergent. Eight states are possible, each one a particular combination of three binary cellular properties deduced to be: (1) ability to deposit pigment, (2) ability to move along the margin of the valve, and (3) the direction of movement. Thus, the patterns are divaricate because alternate mobile pigment states double and segregate in the mantle epithelium, possibly through cell division." @default.
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- W2049075540 date "1982-05-01" @default.
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- W2049075540 title "A New Programmatic Basis for Shell Pigment Patterns in the Bivalve Mollusc Lioconcha castrensis (L.)" @default.
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- W2049075540 doi "https://doi.org/10.1111/j.1432-0436.1982.tb01191.x" @default.
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