Cumulative innovation is a driving force of economic growth. Access costs, the time and effort scientists need to devote to understand existing knowledge, may potentially hinder new innovation. I examine the effect of a decrease in access costs resulting from the adoption of a data reporting standard Minimum Information About a Microarray Experiment (MIAME) on subsequent life sciences research. I take advantage of a natural experiment to implement a difference-in-differences estimate of MIAME on subsequent use of data in journal publications. The results show that microarray data submitted after a journal adopts MIAME is at least 50 percent more likely to be reused. Overall, the evidence suggests that the decline of access costs due to data reporting standards is important for the accumulation of knowledge in the life sciences.