| The culture on this plate was not fully absorbed,
causing the lines of bacteria colonies. This makes it difficult to pick
an isolated, single colony. |
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| This plate was spread with the substrate X-gal.
However, it was not evenly distributed around the edge of the plate. Note
that the center colonies are blue but the ones on the outside appear white. |
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| An enlargement of the plate above, showing the
outer colonies. On this plate, it would be difficult to tell if the white
reprsented the desired colony or just a lack of the X-gal substrate. |
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