Spectral Characteristics: Visible absorption maxima=565>540>498 , Emission maximum=578; This goat anti-llama IgG is used as the 'secondary antibody' for immunofluorescent staining on tissues or culture cells where the primary antibody is generated in llamas. It is highly recommended that proper negative controls, such as omitting the primary antibody, be included in experiments when conducting immunofluorescent staining.