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Fig. 5. Double mutant analysis with class B and C genes affecting organ identity.
(A) ap3-3 mutant flowers produce sepals instead of petals in the
second whorl and stamens are replaced by carpeloid, filamentous organs. (B) In
the roxy1-3 ap3-3 double mutant, fewer sepals of a reduced size are
formed in the second whorl. They are often bent (arrow) and resemble
filamentous structures. (C) ag-1 mutant flowers display a
transformation of stamens into petals and a new mutant flower is initiated in
the fourth whorl. (D-F) roxy1-3 ag-1 double mutant flowers produce
fewer petals in the second whorl that are often reduced in size (arrowheads in
E). However, third whorl petals are not affected and occasionally formation of
a new flower (arrow) can be observed in the second whorl (F).
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