has part
has part
has_part
develops from
has developmental contribution from
Mammalian thymus has developmental contribution from some pharyngeal pouch 3; Mammalian thymus has developmental contribution from some pharyngeal pouch 4 [Kardong]
x has developmental contribution from y iff x has some part z such that z develops from y
developmentally contributes to
developmentally preceded by
anatomical entity
pending final vetting