Epistasis analysis of four genes from Anabaena sp. strain PCC 7120 suggests a connection between PatA and PatS in heterocyst pattern formation.
Orozco CC, Risser DD, Callahan SM. Epistasis analysis of four genes from Anabaena sp. strain PCC 7120 suggests a connection between PatA and PatS in heterocyst pattern formation. J Bacteriol. 2006 Mar; 188(5):1808-16.