directly_develops_from
Candidate definition: x directly_develops from y if and only if there exists some developmental process (GO:0032502) p such that x and y both participates in p, and x is the output of p and y is the input of p, and a substantial portion of the matter of y comes from x, and the start of x is coincident with or after the end of y
RO:0002202
develops_from
is_a