developed SERS nanotags (Figure 7C) composed of a gold core, Raman reporter cells, and a silver shell, which has been used for sensitive and multiplexed identification of cytokines (IFN‐γ, TNF‐α, and IL‐10) secreted from lymphoma cells.[141] This SERS immunoassay showed high sensitivity (4.5 pg mL−1) with good specificity. The gene discussed is IFNG; the disease is lymphoma.