"is immediately downstream of sequence of" . . . . "Chris Mungall" . . . "x is immediately downstream of the sequence of y iff either (1) x and y have sequence units, and all units of x are downstream of all units of y, and x is sequentially adjacent to y, or (2) x and y are sequence units, in which case the immediately downstream relation is primitive and defined by context: for DNA bases, y would be adjacent and 5' to y" . "A 3'UTR is immediately downstream of the sequence of the CDS from the same monocistronic transcript" .