"DerivesFrom (inverse: derivedInto) holds between distinct material objects when one succeeds the other across a temporal divide in such a way that at least a biologically significant portion of the matter of the earlier object is included into the later. \n\nThere is some instant of time t such that the first object exists only prior to and the second one only subsequent to t. \n\nThese relations are borrowed from the OBO Relation Ontology\n\nExample:\n\"Three simple kinds of instance-level derivation can then be distinguished (Figure 3): first, the succession of one single continuant by another single continuant across a temporal threshold (for example, this blastocyst derives from this zygote); second, the fusion of two or more continuants into one continuant (for example, this zygote derives from this sperm and from this ovum); and third, the fission of an earlier single continuant to create a plurality of later continuants (for example, these promyelocytes derive from this myeoloblast). \" from http://genomebiology.com/2005/6/5/R46" . . "derived into" . . . . . . . .