Archemix, a developer of aptamer-based therapeutics, said this week that John Maraganore has been appointed to its board of directors.

Maraganore is currently president and CEO of Alnylam Pharmaceuticals.

LRN, a provider of corporate ethics, compliance, and governance solutions, said this week that it has appointed Alan Spoon to its board.

Spoon is managing general partner for Polaris Venture Partners, an institutional investor in Alnylam Pharmaceuticals.