Two unusual electrophoretic variants of serum albumin occurring along with normal albumin were found in Asians. One (albumin Gombak), a slowly migrating variant discovered in 2 Malayan aborigine sisters, was not distinguishable from a rare variant previously reported in a French family. The other (albumin Medan), a rapidly migrating variant found in an Indonesian family in Northern Sumatra, is distinguishable from 4 other rapidly migrating variants. At least 18 different electrophoretically detectable variants of human serum albumin have now been reported.