0 -> Auxin 0 -> Auxin Auxin -> 0 Ra -> Ra_star Ra_star -> Ra 0 -> PLSm PLSm -> 0 0 -> PLSp PLSp -> 0 Re -> Re_star Re_star -> Re 0 -> ET ET -> 0 CTR1 -> CTR1_star CTR1_star -> CTR1 0 -> X X -> 0 0 -> CK CK -> 0 ACC -> ET IAA -> Auxin CK_ex -> CK