Fgf8 is the major active factor in the AER.

TLS Online TPP Program

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#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 7145

#Unit 6. System Physiology – Plant

Brassinolide binding to the brassinosteroid receptor kinase

BRASSINOSTEROID-INSENSITIVE1 (BRI1) on the plasma membrane triggers a phosphorylation cascade that causes a repressor protein, BRASSINOSTEROID-INSENSITIVE2

(BIN2), to become inactivated. This results in activation of the transcription factors BRI1-EMS SUPPRESSOR1 (BES1) and BRASSINAZOLE-RESISTANT1 (BZR1) and subsequent gene expression

TLS Online TPP Program

#Id: 9831

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7307

#Unit 12. Applied Biology

TLS Online TPP Program

#Id: 560

#Unit 2. Cellular Organization

When polymerase binding causes transition to the open complex and initiates transcription. This gives a low level of constitutive expression called the basal level. 

Binding of RNA polymerase is the rate-limiting step in this case.