OVA-PEG-Cy3 is a conjugate of OVA-PEG labeled with Cy3. The Cy3 fluorophore is widely used in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry, with its maximum emission wavelength approximately at 562-570 nm. Ovalbumins (OVA) are the primary proteins found in egg whites, known for their diverse biological activities, including anticancer, antihypertensive, antibacterial, antioxidant, and immunoregulatory effects. Ovalbumins are the most abundant proteins synthesized in oviducts treated with progesterone or estrogen and are commonly used as markers to study hormone regulation of gene expression in tissues.