Fig. 4. Actin distribution in muscle arms. All muscles shown express GFP::ACT-1 from the extra-chromosomal array trEx[pPRRF207(him-4p::gfp::act-1) in the background of the dpy-5(e61) mutation, which enables better visualization of the muscle arms. (A-C) GFP::ACT-1 in a wild-type background. (A) Magnification of the muscle arm shown in B. Note the long actin cables in A and B (green arrows). (C) A lighter exposure of the same muscle depicted in B. Note the incorporation of GFP::ACT-1 in the thin filaments (blue arrow). Orange arrows point to arborized arm termini, yellow arrows point to disorganized sarcomeres, red arrows point to actin bundles within arms, green arrowheads point to discrete muscle lateral ends, and red arrowheads point to enriched actin in flowing lateral ends of muscle. Scale bars: 25 µm.