Update README.md

README.md

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 # CoVBERT
 
 CoVBERT is a protein language model which speaks the language of SARS-CoV-2 spike proteins!
-Enter a sequence with ```<mask>``` and let CoVBERT predict the mutation at that position!
+Enter a sequence with mask and let CoVBERT predict the mutation at that position!
 CoVBERT has been trained with 50K spike glycoprotein sequences scraped from [GISAID](https://gisaid.org)