The present invention provides a humanized, a chimeric and a human anti CD74 mAb, fragments thereof, an antibody fusion protein, and therapeutic and diagnostic conjugates thereof useful for treatment of mammalian subjects, humans and domestic animals, alone, as a conjugate or administered in combination with other therapeutic agents, including other naked antibodies and antibody {HEAD ~ therapeutic conjugates} as {TAIL ~ part} of a multimodal therapy regimen 
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The present invention provides a humanized , a chimeric and a human anti CD74 mAb , fragments thereof , an antibody fusion protein , and therapeutic and diagnostic conjugates thereof useful for treatment of mammalian subjects , humans and domestic animals , alone , as a conjugate or administered in combination with other therapeutic agents , including other naked antibodies and antibody { HEAD ~ therapeutic conjugates } as { TAIL ~ part } of a multimodal therapy regimen
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