1. Molecular knot: Replace entire text of first page (page 41) by the
following:

Molecular knot
MEGHAN ROSEN

A new molecular knot (representation shown) is the most complex one ever described. It forms a triple braid, with four iron ions (silvery-blue) and a central chloride ion (green) guiding the formation.
One hundred and ninety-two atoms have tied the knot. Chains of carbon, hydrogen, oxygen and nitrogen atoms, woven together in a triple braid, form the most complex molecular knot ever described, chemists from the University of Manchester in England report in the January 13 issue of Science magazine.
Learning how to tie such knots could one day help researchers weave molecular fabrics with all sorts of snazzy properties. “We might get the strength of Kevlar with a lighter and more flexible material,” says study coauthor David Leigh.

2. Page 42: left column, para 5: remove last (SN: 10/29/16, p. 6)

3. Page 42: left column, last para: remove (SN: 1/28/12, p. 12).

4. Page 42, last para of article: Remove, since X-ray structure not shown:
"ALL TIED UP The most complex
molecular knot synthesized by chemists (Xray
crystal structure shown) is formed by
linking atoms of carbon, hydrogen, oxygen
and nitrogen. A single chloride ion (green
sphere in center) and four iron ions (purple
spheres) help the knot form, but can later
be washed away."

5. Also, you can include the two pics sent.