Copyright 1998-2017 Yoshiaki Yoneda
Cotyledonary veins have a reddish tinge.  The cotyledons of this stage react most sensitively to dark treatment for flower bud differentiation.   
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1 x 1 (thumbnail images) : For indexing 2 x 2, 4 x 4, 8 x 8 : For viewing on monitor 8 x 8, 16 x 16 : For printing