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He was a staff scientist with Ron Evans at the Salk from 1986-1990 , where he studied the molecular basis of hormone action as well as developing conditional gene expression systems in transgenic animals . In one local authority , school-based inter-agency meetings were case-based ( ie they only discussed individual pupils ) ; in the other two , their purpose included strategic planning of service delivery as well as individual case discussion . The KZA saw the changing of government policy as central to the struggle , and Bosgra identified the central problem as a lack of policy . Near Windigo Pass , OR , mountain hemlock makes up an increasing proportion of tree regeneration as elevation and pumice depth increase ( 56 ) and so becomes increasingly important for reforesting these harsher sites .