An interleukin-4-dependent precursor clone is an intermediate of the differentiation pathway from an interleukin-3-dependent precursor clone into myeloid cells as well as B lymphocytes.

An interleukin-3-dependent progenitor clone LyD9 and its interleukin-4-dependent derivative clone K-4 were shown to differentiate into myeloid cells as well as B lymphocytes by coculture with bone marrow stroma cells. The K-4 clone is an intermediate between myeloid/lymphoid cells and the LyD9 clone that requires interleukin-4 for differentiation into B lymphocytes and myeloid cells. Granulocyte-macrophage colony stimulating factor-dependent derivatives (LS-1 and K-GM) were also established from induced LyD9 cells. LS-1 and K-GM were myeloid-committed cells.