system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do cells ‘stick together’ to form different surfaces in your body?

There’s obviously a very distinct difference between the feeling (for lack of better word) of your skin versus say a vein, your eyes, your tongue, etc. What makes them ‘feel’ different, or I guess have different textures? I know of course DNA, but molecularly what is the difference between a tongue cell and a skin cell that makes it look and feel so different? I hope my question makes sense!
gpt
The sticking part is also accomplished by proteins that go through both cells. Desmosomes and Hemidesmosomes. A mutation in the gene for them causes "butterfly children" (super tragic and graphic.  Do not Google.)