Table 5.

Top 20 keywords in terms of frequency in nTRP channels research

Rank	keywords	Frequency	Rank	keywords	Frequency
1	expression	3419	11	calcium	1177
2	activation	3270	12	inflammation	1151
3	protein	2180	13	identification	1128
4	mechanism	2028	14	trp channel	1124
5	receptor	2011	15	inhibition	1062
6	ion channel	1786	16	tryptophan	1036
7	trpv1	1733	17	gene	1005
8	channel	1718	18	rat	965
9	pain	1366	19	binding	929
10	cell	1300	20	oxidative stress	924