The resulting modified royalty structure, which includes fixed minimum and maximum payments in years until 2020, has resulted in the Company recognising liabilities, and corresponding prepayments, for the discounted value of total minimum payments. The current portion of the prepayment is $260m (2014: $323m; 2013: $350m) and is reported in amounts due within one year (see Note 15). Non-current other receivables also include prepayments in relation to our research collaboration with Moderna Therapeutics.