Due to their biocompatibility, RNTs are able to deliver hydrophobic drugs due to the presence of a hydrophobic core channel and a hydrophilic outer surface. Therefore, hydrophobic drugs can be incorporated into the core channel, interacting with the core itself. The hydrophilic outer surface shields the hydrophobic core loaded with the hydrophobic drug. This allows for a prolonged release of the drugs into the bloodstream or the targeted cells. In fact, RNTs were shown to target fish lymphocytes, and the toxicity of the RNTs were tunable based on surface functionalization. One application of RNTs is the metallization of the RNTs. One study that incorporated Au nanoparticles onto the surface of the RNTs, with an approximate maximum loading capacity of 30%. RNTs can be used as biosensors as well as drug delivery vehicles, which can, in the case of cancer, provide both diagnostics and therapeutics, or "theranostics". 18 Thus, RNTs are easily functionalized by covalently bonding a side group to the G∧C motif. Tripathi et al. showed that RNT porins can be used as transmembrane channels with selective ion and small molecule transport. These RNT porins were self-assembled single molecule sensors, acting as selective nanofilters, similar to nanofilters made up of CNT porins. Simulations of the CNT porins showed that short CNTs were able to insert themselves inside a lipid bilayer to create transmembrane channels. Functionalized CNT porins are a promising biomimetic material for cell interfaces, sensors, and studying biological channels as they can selectively transport water, protons, small ions, and DNA. Aquaporins, the family of mammilian water channels, facilitate the rapid osmotic transport of water across cell membranes, which are involved in a number of physiological processes: regulation of body temperature, reproduction, digestion, neuro-homeostasis, and so on. Since CNT porins can mimic the biological protein, Aquaporin-1, which has a hydrophobic region with a narrow channel that forces water to translocate in single file, they can be used to develop bioinspired water filtration systems. Biomimetic water channels could help in the understanding of physiological processes and could aid in the development of bioinspired technology for water filtration or biosensors.