A process that forms a boundary that limits the spreading of heterochromatin along a chromosome.

Catalysis of the reaction: 5'-AMP-DNA + H2O = AMP + DNA; nucleophilic release of a covalently linked adenylate residue from a DNA strand, leaving a 5' phosphate terminus.

A histone deacetylase complex which deacetylates histones preferentially in promoter regions. Composed of a catalytic histone deacetylase subunit, an Sds-3 family protein, a SIN3 family co-repressor, a WD repeat protein, and a zf- PHD finger (Clr6, Sds3, Pst1, Prw1, Png2 in Schizosaccharomyces pombe; Rpd3p, Sin3p, Ume1p, Pho23p, Sap30p, Sds3p, Cti6p, Rxt2p, Rxt3p, Dep1p, Ume6p and Ash1p in Saccharomyces cerevisiae).

OBSOLETE. The addition of a halogen to a protein amino acid.

OBSOLETE. The iodination of peptidyl-thyronine, formed from tyrosine.

OBSOLETE. The addition of one or more iodine atoms to an amino acid residue in a protein.

Binding to a sialic acid, a N- or O- substituted derivative of neuraminic acid, a nine carbon monosaccharide. Sialic acids often occur in polysaccharides, glycoproteins, and glycolipids in animals and bacteria.

Any process that activates or increases the rate or extent of osteoblast proliferation.

OBSOLETE. The bromination of phenylalanine.

The modification of N-terminal peptidyl-serine to lactic acid.

The modification of peptidyl-cysteine or peptidyl-serine to peptidyl-L-3-oxoalanine; characteristic of the active sites of arylsulfatases.

The formation of (Z)-dehydrobutyrine by the dehydration of peptidyl-threonine.

OBSOLETE. The bromination of peptidyl-tryptophan, to form peptidyl-L-6'-bromotryptophan.

Binding to the microtubule constituent protein gamma-tubulin.

Binding to the microtubule constituent protein alpha-tubulin.

Any process that stops or prevents the binding and fusion of a sperm to the oocyte plasma membrane.