blastogenesis
A biological term referring to the process of cell or tissue development from undifferentiated cells, often used in immunology or developmental biology.
Lymphocyte blastogenesis is used as an indicator of immune response.
Compound of 幼若 (young, immature) + 化 (-ization) + 反応 (reaction). The exact derivation is uncertain; it is a technical term likely coined in Japanese biology.