Reference Tools
PubMed – search engine for biomedical literature
Google Scholar – a more general search engine for scientific papers and patents (if you can’t find it using PubMed, try here!)
Protein tools
ExPASy ProtParam tool – computes various chemical and physical parameters for a given protein sequence, including molecular weight and theoretical pI
MUSCLE multiple sequence alignment tool – creates an alignment for up to 500 sequences at a time
beta-lactamase database – catalog of variants found in clinical settings