organism: Caenorhabditis elegans
attributes.tag: source_name
attributes.value: Mature sperm isolated from adult males
attributes.tag: strain and  genotype
attributes.value: CB1489 him-8(e1489)
attributes.tag: purity of sample
attributes.value: ~99%
attributes.tag: chip antibody
attributes.value: none
attributes.tag: xchromosome
attributes.value: autosome ratio: X:A=0.5:1 (50% of sperm have an X, another 50% do not have an X)