RT Journal Article SR Electronic T1 Simultaneous optogenetic manipulation and calcium imaging in freely moving C. elegans JF bioRxiv FD Cold Spring Harbor Laboratory SP 000943 DO 10.1101/000943 A1 Frederick B. Shipley A1 Christopher M. Clark A1 Mark J. Alkema A1 Andrew M. Leifer YR 2013 UL http://biorxiv.org/content/early/2013/12/01/000943.abstract AB