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#4. The R represents the side chain of the amino acids which make up the anti-parallel beta sheet. Since a wide variety of side chains can exist on a beta -sheet, they generalize the structure by writing Rs instead of specific amino acid side chains.
R1b is the branch of the human family tree marked by the mutation M343+ . It is the most common Y chromosome clade of paternal lineages across much of Europe.There are several larges subclades of R1b so there are several large subclade projects, one of which will be important to you.Be sure to read the Analysis and Commentary on the Results page of this project.his project is only for those R1b people who are willing to be added to the appropriate subclade projects. The largest subclades projects are the P312, U106, L21, DF27, U152, ht35 (M269+ P312- U106-) and R1b asterisk (P297+ M269-) projects.