If a human were unable to produce lymphoid progenitor cells, then the immune system that is most likely should be impacted is the Adaptive immune system.
The adaptive immune system is a part of the immune system that fights against pathogenic microorganisms after the first recognition encounter between the body and these harmful organisms.
This system (adaptive immune system) is based on lymphoid progenitor cells that generate and differentiate immune T cells and B cells.
In conclusion, lymphoid progenitor cells are directly associated with the adaptive immune responses.
Learn more about the the adaptive immune system here:
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