- histone H3S28 kinase activity
Catalysis of the reaction: histone H3-serine (position 28) + ATP = histone H3-phosphoserine (position 28) + ADP. This reaction is the addition of a phosphate group to the serine residue at position 28 of histone H3.
- B-1b B cell differentiation
The process in which B cells acquire the specialized features of B-1b B cells. B-1b B cells are B-1 cells that do not express CD5.
- B-1a B cell differentiation
The process in which B cells acquire the specialized features of B-1a B cells. B-1a B cells are B-1 cells that express CD5 and arise from fetal liver precursors.
- C-22 sterol desaturase activity
Catalysis of the formation of the C-22(23) double bond in the sterol side chain. An example reaction: 5,7,24(28)-ergostatrienol + O2 + NADPH = 5,7,22,24(28)-ergostatetraenol + 2 H2O + NADP+.