human isolated, synthetic or recombinant antibody, or a functional part or a functional equivalent thereof, isolated, synthetic or recombinant nucleic acid molecule, vector, isolated or recombinant cell or non-human animal, composition, use of an antibody or functional part or functional equivalent, and methods for producing an antibody or functional part or functional equivalent, for detecting myeloproliferative or lymphoproliferative cells, for determining whether a myeloid or lymphoid cell is a myeloproliferative or lymphoproliferative cell, for identifying myeloproliferative or lymphoproliferative cells, for To determine whether myeloproliferative or lymphoproliferative cells are present in a sample to treat and / or prevent a myeloproliferative or lymphoproliferative disorder, to determine whether an individual suffers from a myeloproliferative or lymphoproliferative disorder to typify a sample containing m cell. or a lymphoid cell-containing sample from an individual, and, to det