Sure you can put it in again. Take the yarn strand between stitches where it was originally, give it a twist and pull the yarn from the row above through it to make the next stitch and so on until you get back to where you are now. It's like picking up a dropped stitch as show in the Fixing Mistakes section of the Tips page. It's just that you pick up the yarn with a twist like the original M1 to start.
sue- knitting heretic