 On some versions of the DST view, genes have no uniquely privileged role in repeated cycles of development (Griffiths 2001; Griffiths &amp; Gray 1994b). In fact, no element of the developmental matrix plays any privileged causal role—not genes, not organisms, not the environment, not anything. Everything counts as a resource; however, in particular situations, certain resources will play more important roles than other resources. In rejecting any privileged role for genes, advocates of DST are especially skeptical of one particular role supposedly played by genes—the transmission of information. According to some, information is central to developmentalism, but genes are not the only mechanisms for information transfer. According to others, information plays no role in the emerging developmentalist perspective. The developmental system as a whole is the unit of selection [see the entry on  units and levels of selection].  If genes have no special role and whole developmental cycles are replicators, as some developmental systems theorists argue, the distinction between replicator and interactor becomes blurred.