... during ontogeny J Exp Med 180:507 17 Hardy, R R., Carmack, C E., Shinton, S A., Kemp, J D and Hayakawa, K 1991 Resolution and characterization of pro-B and 22 23 24 25 26 27 28 29 30 31 32 33 34 ... Identification of the SH2 domain binding protein of Bruton’s tyrosine kinase as BLNK—functional significance of BtkSH2 domain in B-cell antigen receptor-coupled calcium signaling Blood 94: 23 5 7 11 Ishiai, ... mutant mice lacking the tyrosine kinase Syk (27 ,28 ) and to mice with disruption of the p85α subunit of phosphoinostitide 3- kinase (PI-3K) (29 ,30 ) All these mutant mice had a block in the pro-B to...