May function in protein folding and assembly, and disassembly of protein complexes. Up-regulated in aspidocytes, a resistant cell type induced from amoebae by a range of toxins including heavy metals and antibiotics. Belongs to the heat shock protein 70 family. The gene for this protein is duplicated in strains AX3 and AX4. These strains contain a duplication of a segment of 750 kb of chromosome 2 compared to the corresponding sequence in strain AX2.