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Furcula development question

I need to figure out how to explain the developmental aspect of the avian 
furcula. I know that the wishbone is a non-endocartilarinous element that 
develops as a connective tissue precursor with no cartilage present. However, 
our clavicle does develop with both a cartilaginous and connective tissue 
precursor. Does this imply the same for theropods and birds? I do not know. Can 
anyone help me out?