the monoclonal reagents dnl 1.9 , 14.8 and ra3-3a1/6.1 , which react with the surface protein b220 ( ly5 ) on pro-b , c mu- pre-b , c mu+ pre-b , and surface ig+ b cells , revealed the presence of positive cells in nude-xid mice .
C1292769
pre-b
C0004561
b cells