Sublime

sparked speculation that there may have been an ancient time, before the advent of proteins, when ribozymes ruled catalysis.

to appreciate how it’s possible for RNA to be an enzyme, one needed to see it in three dimensions.

White blood cells:

knots, and a myriad of other possible shapes.

This is what microRNAs add to nature’s toolkit: the ability to regulate the translation of specific mRNAs.

we are in the presence of a more or less specific catalyst.

the far-reaching goal would be the entrapment of an entire enzymatic cycle.