Specialising

verb (used without object), specialized, specializing.
1.
to pursue some special line of study, work, etc.; have a specialty:
The doctor specializes in gastroenterology.
2.
Biology. (of an organism or one of its organs) to be adapted to a special function or environment.
verb (used with object), specialized, specializing.
3.
to render special or specific; invest with a special character, function, etc.
4.
to adapt to special conditions; restrict to specific limits.
5.
to restrict payment of (a negotiable instrument) by endorsing over to a specific payee.
6.
to specify; particularize.
verb
1.
(intransitive) to train in or devote oneself to a particular area of study, occupation, or activity
2.
(usually passive) to cause (organisms or their parts) to develop in a way most suited to a particular environment or way of life or (of organisms, etc) to develop in this way
3.
(transitive) to modify or make suitable for a special use or purpose
4.
(transitive) to mention specifically; specify
5.
(transitive) to endorse (a commercial paper) to a specific payee

specialize spe·cial·ize (spěsh’ə-līz’)
v. spe·cial·ized, spe·cial·iz·ing, spe·cial·iz·es

To limit one’s profession to a particular specialty or subject area for study, research, or treatment.

To adapt to a particular function or environment.