# GATE2013-3

Protein A, which has strong affinity to $F_C$ region of immunoglobulin, is extracted from
1. $\text{Saccharomyces cerevisiae}$
2. $\text{Staphylococcus aureus}$
3. $\text{Streptococcus pyogenes}$
4. $\text{Streptococcus sanguis}$