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Senior chemistry professor writing on the board while having a chalk and blackboard lecture (shallow DOF; color toned image)

Stock Photo:
Image ID: 123383920
Release Information: Signed model release filed with Shutterstock, Inc
Small
500x334 6.9"x4.6" (72dpi) 158 KB
Med
1000x667 3.3"x2.2" (300dpi) 554 KB
Large
5316x3544 17.7"x11.8" (300dpi) 8.0 MB
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