Light Micrograph of a longitudinal section of embryo sac in transverse section of ovary of Lily (Lilium). Immature female gametophyte. Two antipodal cells are at the top, triploid polar nucleus is next, a haploid polar nucleus is on the left, and three haploid nuclei are at the bottom (oosphere, or egg nucleus, and two synergid nuclei). Magnification x250 at 6 cm.