Mechanists have developed several extended examples of the many forms of mechanism integration pursued in mechanistic research programs. Darden (2005), for example, suggests that philosophers in the grip of classical reduction fundamentally misunderstood the relationship between Mendelian and molecular genetics. While reductionists see it as an instance of interlevel explanation, she argues, it is in fact a case in which different scientists worked on different parts of a mechanism that are etiologically (not constitutively) related to one another. Mendelian genetics did not reduce to molecular biology; rather, classical geneticists and molecular biologists integrated their work by focusing on different working entities in the sequentially operating chromosomal and molecular hereditary mechanisms. Examples have also been drawn from the discovery of the mechanisms of protein synthesis (Darden 2006) and cell biology (Bechtel 2006). Craver (2007) uses examples from the neuroscience of memory to explore how multilevel integration does and ought to proceed. In each case, the search for mechanisms serves as an abstract scaffold onto and around which the findings of diverse scientists converge.