Question $23(4$ points$)$

Match the tissue region of a cnidarian or planarian body with a secreted signaling molecule it produces to regulate polarity during homeostasis or regeneration. There are more matching choices than correct answers. A matching choice can be used more than once.

Planarian posterior

Hydra oral end

Hydra aboral end

Planarian anterior

Nematostella oral end

Notum

FGF ligand

Wht ligand

Unknown

Erk