Photographs of the four markers evaluated in the study. The MammoMARK™ (Mammotome, Cincinnati, OH), HydroMARK® (Mammotome, Cincinnati, OH) and MammoStar™ (Mammotome, Cincinnati, OH) are depicted in both their hydrated and non-hydrated states, courtesy of Mammotome. The SecurMark® (Hologic, Bedford, MA) was provided courtesy of Hologic.