specialize

verb

• concentrate on and become expert in a particular subject or skill:he could specialize in tropical medicine
• confine oneself to providing a particular product or service:the firm specialized in commercial brochures
• make a habit of engaging in a particular activity:a group of writers have specialized in attacking the society they live in
• [with object] Biology adapt or set apart (an organ or part) to serve a special function or to suit a particular way of life:zooids specialized for different functions