00349nam a2200133 a 450000500170000002000150001708200160003210000060004811000220005424500620007626000220013830000210016049000340018120251203091715.0  a0199633908  a571.84bCEl  d_  aHartley, David A.  aCellular interactions in development: a pratical approach  aOxfordbOUPc1993  axviii,214p, 22cm  aThe practical approach series