Expr541
Faint expression in AB at 2-cell stage, becoming stronger in AB descendants after 4-cell stage. Signal weakens, between the 8- and 28-cell stages. GLP-1 not detected again until after the 100-cell stage in unidentified cells.
Expr572
SKN-1 protein first becomes visible in oocyte and sperm pronuclei before the first mitotic division of the zygote. SKN-1 becomes cytoplasmic as AB and P1 enter mitosis. P2 and EMS have more SKN-1 than AB daughters. By the 8-cell stage, the granddaughters of AB do not stain for SKN-1, but P1 granddaughters do. SKN-1 is not detectable by the 12-cell stage.