Squid Protein Could Make Better Prosthetics
Unfortunately it won't allow humans to squirt ink, at least not yet.
Getting living tissues and electronic materials like those in prosthetics and implants to play nice is anything but easy, for a whole number of reasons. But there is a very simple one you may not have considered: electronics send signals via negatively charged electrons, whereas many communications carried out in living tissues take place through the movement of positively-charged particles such as calcium and potassium ions. But scientists have discovered a protein found in an animal called the common pencil squid that conducts protons, as described by Genetic Engineering and Biotechnology News:
The fact that it is a biologic material and flexible means that it may be better than existing materials for integrating into the human body, and with a lower chance of being rejected, the researchers (from the University of California, Irvine) said. And since it is a protein, it could be modified in other desirable ways, such as possibly being able to biodegrade after it is down serving a useful purpose, which could help avoid dangerous surgeries.
[Genetic Engineering and Biotechnology News / Nature Chemistry]