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Fig. 2. Comparison of mature leaf form and KNOX1 expression patterns in simple and
compound leaves. (A) Amborella trichopoda has simple leaves. (B)
KNOX1 proteins accumulate in the shoot apical meristem (SAM) of A.
trichopoda, except in the incipient leaf primordium (red asterisk). (C)
Oxalis has compound leaves. (D) In Oxalis, KNOX1 proteins
accumulate in the SAM and in developing leaves. LP, leaf primordia; P1,
primordium 1; M, meristem. Images adapted, with permission, from Bharathan et
al. (Bharathan et al.,
2002).