The source of restriction enzyme Sam1 is?

Streptomyces achromogenes

Serratia marcescens

Streptococcus pyogens

Staphylococcus aureus

Research articles and patents mention Sam1 in the context of Streptococcus pyogenes.

Specifically, some studies discuss a strain of S. pyogenes (JRS4) and an isogenic protein F-derivative of JRS4, both associated with Sam1.