The placentas often occur in distinct lines called lines of placentation. Each locule has one to 50 ovules that are anatropous or hemianatropous with axillar placentation. The ovary is superior with basal or free-central placentation. The ovary is superior with an axile placentation, two locules and two carpels. During the formation of the placenta (placentation), circulating NK cells are recruited. In animals exhibiting hemochorial placentation, the endometrium undergoes decidualization following implantation. Ovaries are superior, often with parietal placentation. They have to invest in internal fertilization, placentation, and gestation, followed by childbirth and lactation. The ovary is inferior and has only one ovule, with basal placentation. It has basal placentation, with 1 locule and 5 carpels. Each carpel will usually have a distinct line of placentation where the ovules are attached. After implantation of the embryo, the decidua further develops to mediate the process of placentation. The ovary is superior, with axial placentation, with capitate or lobed stigma. Gyanoecium pentacarpellary, ovary superior, placentation axile, syncarpous. Ovary 5 carpellary, placentation axile.