Just four letters....

It takes just four repeating molecular letters - adenine (A), thymine (T), guanine (G) and cytosine (C), and a fifth, uracil (U) in RNA - to give you this:

and this

 
or this  

 
and this 

 A-T, G-C, T-A, C-G, A-T, .... C-G, A-T, G-C, A-T, G-C ....

Knit together

Wondorously

As YOU

ooooooooooooooooooooooooo

One purl, one plain
(courtesy Psalm 139)

 
For you created my inmost being

one purl, one plain

you knit me together in my mother's womb

one purl, one plain

My frame was not hidden from you

one purl, one plain

when I was made in the secret place

one purl, one plain

When I was woven together in the depths of the earth

one purl, one plain

I praise you

one purl, one plain

because I am fearfully,

one purl, one plain

and wonderfully,

one purl, one plain

made
 

One pearl, unplain

ooooooooooooooooo