This view of natural kinds has been deployed to argue for taxonomic revision in, for example, the biology of human emotion (Griffiths 1997), the structure of concepts (Machery 2009), and the taxonomy of psychiatry (Kendler, Zachar, and Craver 2010; see Craver 2009): a putatively single kind is split into multiple kinds because it is discovered that distinct properties in a property cluster are explained by distinct mechanisms. This view of kinds can also be used to make sense of kinds that are historically transient and, in some ways, the product of human attitudes and so socially constructed in this straightforward sense; perhaps race is like this (see Kuorikoski and Pöyhönin 2012; Khalidi 2013).