Hyalin is a protein released from the cortical granules of a fertilized animal egg.
The protein has strong adhesive properties which can help with cell differentiation and as a polyspermy prevention component.
[2] Both forms of these filaments often fold on themselves, making the protein heterogeneous, resulting in poorly resolved stains on a gel.
The tandem repeat region was then found to be on the filamentous part of hyalin when the antibodies bound to it.
As many as 21 of these long repeats can be present, accounting for 230 kDa of the total mass and two-thirds of the filamentous region.
[1] Cortical granules migrate to the inner plasma membrane where they remain inactive until the cell depolarizes.
This mRNA is expressed around the blastopore at the endoderm-ectoderm boundary, which is rich in rough endoplasmic reticulum.
Some monoclonal antibodies were identified to carry molecules to the apical surface of ectodermal cells.
Hyalin helps cells differentiate into the animal and the vegetal halves during oogenesis by utilizing zinc and lithium ions.
Invagination of the blastula occurs when the endoderm loses its affinity towards hyalin, while the ectoderm retains it.
[9] This leads to the keystone shape of the gastrula, with the different layers forming into separate biological systems.
The fertilization envelope is the hardened mechanical barrier that blocks additional sperm from penetrating the cell.
Underneath the fertilization envelope is the hyaline layer, which covers up sperm receptors in the egg's plasma membrane.
Should the fertilization envelope not form or dissociate, the hyaline layer alone blocks against polyspermy.