Final answer:
The "master regulator" of terminal plasma cell differentiation is Blimp-1. Blimp-1 is a transcription factor that plays a critical role in the differentiation of B cells into plasma cells.
Step-by-step explanation:
The "master regulator" of terminal plasma cell differentiation is Blimp-1. Blimp-1 is a transcription factor that plays a critical role in the differentiation of B cells into plasma cells. It suppresses the expression of genes that promote B cell identity and activates genes involved in plasma cell function, such as antibody production.