What are "+" and "Ar" in consensus binding sequence of amino acids? So I was reading this paper and found a figure as below: ![enter image description here]( I understand that **[LEAM]** means any of LEAM residues, **pS** is phosphoserine and **X** means any amino acid residue. _What is **[+]** here ? Is both **R** and **Ar** arginine itself?_

`Ar` means aromatic and `+` means positively charged residues. However, this is not a standard code (as of now).

From the same paper:

> Sequences closely matching these optimal binding motifs, R-X-[Ar/S]-[+]-pS-[LEAM]-P and R-[S/Ar]-[+]-pS-[LEAM]-P, denoted as mode 1 and mode 2 consensus sequences, were found to be present in many known 14-3-3 ligands ( Yaffe et al. 1997), **where Ar denotes aromatic residues and + denotes basic residues.**