Subject: Time:11:53 AM OFFICE MEMO spermidine Date:9/13/94 to those doing biolistic transformation- what source of spermidine free base do you use? Sigma has three different catalog #s, s2626, s0266 and s4139. Are these all usable, or is one better than the others? thanks for any help Mitch Favreau Hallicklab at tikal.biosci.arizona.edu