Which of the following activity a mammalian erythrocyte CANNOT perform ?

Mature mammalian erythrocytes (red blood cells) are highly specialized for the transport of respiratory gases. To maximize the space available for haemoglobin, these cells lack a nucleus, mitochondria, and ribosomes. Because they lack a nucleus (which contains DNA) and ribosomes, they are incapable of protein synthesis and cell division.

However, they are perfectly adapted for their other functions: their biconcave shape and flexible membrane allow them to squeeze through narrow capillaries, and their thin membrane facilitates the diffusion of oxygen. Since they cannot repair themselves or divide, they have a limited lifespan of approximately 120 days in humans before being destroyed in the spleen.