A mutant staphylococcal alpha hemolysin polypeptide containing a heterologous analyte-binding amino acid which assembles into an analyte-responsive heptameric pore assembly in the presence of a wild type staphylococcal alpha hemolysin polypeptide, digital biosensors, and methods of detecting, identifying,...http://www.google.co.uk/patents/US20050131211?utm_source=gb-gplus-sharePatent US20050131211 - Designed protein pores as components for biosensors
