In this paper, we present a framework for cell manipulation tasks with
visual servoing micromanipulation strategies.  A vision based
micropositioner is designed in order to address the requirement of
high precision needed to perform manipulation of objects under 100
microns in size.  The system calibration (microscope-camera-micropositioner)
and the model of the observed scene are not known. Experimental results for
micropositoning tasks with respect to protein cells are presented and
demonstrate the validity of the proposed approach.