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William Patel——Works at Apple, Lives in Cupertino, CA
Repeat this step for all 15 of the chromatography strips.Figure 2. Each chromatography strip will have an origin line. ... Figure 3. A marker or pen should be used to put a single spot of black ink in the middle of the origin line on the chromatography strip.Figure 4. ... Type of Marker or Pen:
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