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Patterning two different antibody layers on the same silicon surface: (1) immobilization of mouse IgG with LMPA protection layer, (2) photoresist patterning, (3) oxygen plasma etching followed by photoresist strip, and (4) immobilization of human IgG and removal of protective LMPA pattern using GELase. Adapted with permission from W.-C. Sung et al., Anal. Chem. 81, 7967 (2009). Copyright 2009 American Chemical Society.
