Sulston was one of 20 Nobel laureates who signed the "Stockholm memorandum" at the 3rd Nobel Laureate Symposium on Global Sustainability in Stockholm, Sweden on 18 May 2011.[4]
One of Sulston's most important contributions during his research years at the LMB was to find the precise order in which cells in C. elegansdivide. In fact, he and his team succeeded in tracing the nematode's entire embryonic cell lineage. Sulston was a leading campaigner against the patenting of human genetic information.