Certain kind of molecules like to associate with the clay. For example, in this case, RNA, shown in red -- this is a relative of DNA, it's an informational molecule -- it can come along and it starts to associate with the surface of this clay.
S jílem se totiž spojují molekuly, jako třeba RNA (vyznačená červeně). RNA je obdoba DNA. Nese informaci a může se navázat na povrch jílu.