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Fig. 8. A model of genetic interactions between stem cells and incipient leaf primordia in the SAM. STM represses AS1 and AS2 in stem cells and their immediate derivatives in the SAM. AS1 and AS2 together repress expression of KNAT1 and KNAT2 in organ primordia and may interact with each other. Expression of KNAT1 and KNAT2 is restricted to peripheral domains in the SAM. LOB is expressed in a region between the SAM and organ primordia and is activated by AS1-AS2 and KNAT1.





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