part of immediately_preceded_by life cycle stage blastula stage Carnegie stage 03 Carnegie stage 04 5.5 human_developmental_stage EHDAA2:CS04 Usually starts between day 5 and day 6 post-fertilization. XUO:0000133 Note that GO treats blastocyst attachment and implantation (CS05) as synonymous CS04 Blastula stage during which the blastocyst becomes attached. FMA:295908 HsapDv:0000008