Why these transcription factors have fused name from two different protein For e.g AP2 play their role in flower development and ERF is ethylene response factor, But in ABA signalling in abiotic stress. We write them together as a single transcription factor protein.

One answer could be that this is different protein but shared the conserved domain or motif of AP2 and ERF.

Second answer could be that this is the superfamily name which consist both transcription factors in it. But why we mentioned it like a single protein (see in figure )in ABA signalling.

I need some clarity.

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