Fig. 7
From: Advances of medical nanorobots for future cancer treatments
A Relationship between pH gradients and the extent of hypoxic regions in tumors. B Vascular densities and acidity levels in different regions of a tumor. Modified and reprinted from ref. [292]. Reproduced with permission, Copyright 2021, Springer Nature. C The main components of the MTB strain MC-1 nanorobot. Modified and reprinted from ref. [293]. Reproduced with permission, Copyright 2016, MDPI, Basel, Switzerland