Fill in the grid then rearrange the letters in the orange shaded squares to find the secret word (7). Complete the answer form and send to the following address by 1 August 2007: Vital, BDJ, Nature Publishing Group, 4-6 Crinan Street, London N1 9XW.

The sender of the first correct solution drawn on 1 August 2007 will win a magnum of Laurent-Perrier Brut champagne.

The answers and name of the prize winner will be announced on 22 September 2007, when the autumn issue of Vital is published in print and online. Check out www.nature.com/vital .

Secretword winner

Dental nurse Mrs Gill Alexander from Surrey won the spring Secretword. The secret word was SPATULA. The completed crossword is shown below.