Table 2.

Search strategy for systematic literature review of all databases. (*: to obtain both singular and plural forms of the search criterion).

No	Keywords
1	Nanoparticle *
2	Particle *
3	Biomaterial *
4	Material *
5	Natural material *
6	Cellular pathway *
7	Signaling pathway *
8	Biomedical application *
9	Regenerative medicine application *
10	Or/1–5
11	Or/6–9
12	And/10 & 11
13	Limit 12 to period: 2014–2021