# How to write a palindrome sequence as-wish (create, theoretically) ? (self-answered)

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There are specific examples from nature, of palindromic sequences.

But without memorizing them, is there any way to randomly write or create or derive a palindromic sequence for a theoretical discussion?

by the way, Genetic palindromes are not an exact ditto of verbal-palindrome.

I once developed a method, but it is so-basic and simple that I'm pretty sure it is already discovered. Here I "shared my knowledge, Q&A-style"

## Step-1

Write a small sequence randomly.

``5'… A T G C C``

## Step 2

Write the sequence in opposite-direction, on the next line. It will end at just at the next-place of last place of previous sequence, i.e.

``--------> 5'… A T G C C C C G T A… 5' . <-------------``

## Step-3

Fill-in-the blanks following base-pair rule, and the sequence is now ready.

5'… A T G\$:\$ C C\$:\$ | G G C A T… 3'

3'… T A C G G | C C G T\$:\$ A… 5'

The previous method was similar way we usually read a verbal palindrome (though unlike a verbal palindrome, any reflection-symmetry was Not present ). But there is a rotational-symmetry (2-fold), (rotational symmetry means it contains parts which are superposable on rotation).

So we could create a palindromic sequence using rotation also.

Or could rotate pre-filled up sequence (if exactly follow the user's instructions)

The brown dot indicates the axis of rotational-symmetry of the written-sequence, vertical to the plane of paper.

1. Colver

It's a pity that I can't speak now - I'm in a hurry to get to work. But I will return - I will definitely write what I think.

2. Ikaika

Now everything became clear to me, thank you for the information you need.

3. Zulkir

Here and so it also happens :)

4. Taugami

In it the whole thing.

5. Daigrel

damn, my pancake won't work! (