spe·cial·ize 
(spĕshə-līz′)
(spĕshə-līz′)v. spe·cial·ized, spe·cial·iz·ing, spe·cial·iz·es
v.intr.
1.
a. To pursue a special activity, occupation, or field of study: a doctor who specializes in cardiology.
b. To provide something in particular or have something as a focus: The shop specializes in mountain-climbing gear.
2. Biology To become adapted to a specific function or environment; undergo specialization.
v.tr.
1. To give a particular character or function to: specialized her field of research.
2. Biology To adapt to a particular function or environment; cause to undergo specialization.
3. Archaic To make specific mention of; specify.