specialise

verb

1. devote oneself to a special area of work"She specializes in honey bees"
2. be specific about"Could you please specify your criticism of my paper?"
3. suit to a special purpose"specialize one's research"
4. become more focused on an area of activity or field of study"She specializes in Near Eastern history"
5. evolve so as to lead to a new species or develop in a way most suited to the environment