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Celebrating #FlyDay to commemorate the isolation of w1118 mutant by Prof Robert Lewis while in Rubin lab. The 1st white (W) eyed mutant was isolated in Morgan lab (see inset for 1st sentence of his paper) which contributed significantly to the chromosomal theory of inheritance. 
To know more in details about the first white mutants, here is a tweet by @sci_flies
W1118 mutant is a heavily used fly stock for transgenic generation as it makes it super easy to screen transgenics that have mini white as a marker. Our facility @BLiSc uses this strain extensively and has generated ~7000 transgenic flies in past 10 years.
