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After fertilization, the conceptus travels down the fallopian tube towards the uterus while continuing to divide[4] without actually increasing in size, in a process called cleavage.[5] After four divisions, the conceptus consists of 16 blastomeres, and it is known as the morula.[6] Through the processes of compaction, cell division, and blastulation, the conceptus takes the form of the blastocyst by the fifth day of development, just as it approaches the site of implantation.[7] When the blastocyst hatches from the zona pellucida, it can implant in the endometrial lining of the uterus and begin the gastrulation stage of embryonic development.[citation needed]