The acquisition of movable jaws was a major event during vertebrate evolution. The role of NK3 homeobox 2 (Nkx3. 2) transcription factor in patterning the primary jaw joint of gnathostomes (jawed vertebrates) is well known. however knowledge about its regulatory mechanism is lacking. https://www.bekindtopets.com/flash-offer-Tie-Untitled-by-Helen-Dale-Samson-One-of-Twelve-great-save/