Are all functions cared out by other cells

In a sense, all functions are technically carried out by other cells. our whole bodies are composed of cells. Groups of cells make tissues, groups of tissues make organs, and groups of organs makes an organism. So, technically, yes.

the cytokine-activated janus kinase (jak)-signal transducer and activator of transcription (stat) pathway has an important role in the control of immune responses. dysregulation of jak-stat signaling is associated with various immune disorders.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?