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titleWelcome

This area will be developed as a way of capturing best practices when using the HELM notation. 

Please do let us know if you have an item you would like to add, or a question on HELM. You can use the issue list or email us at info@openHELM.org or just add a comment to the end of this page!

Handling monomers in lists

HELM allows users to specify lists of alternative monomers or mixtures in any order. So PEPTIDE1{(A+dA)}$$$$V2.0 and PEPTIDE1{(dA+A)}$$$$V2.0 are exactly the same. However this can get confusing when there are long lists of monomers and also make comparisons between HELM strings more difficult.

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However, there is no point to doing this as the notation assumes that the ratio of the components are unknown if the proportions are not specified: PEPTIDE1{(A+A+L+L+A+V)}$$$$V2.0 is exactly the same as PEPTIDE1{(A+L+V)}$$$$V2.0. and the latter example is much clearer to read.

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