Add term Gel phase of basement membrane

[DaiqingChen]

• Suggested term label:
  Gel phase of basement membrane

• Definition
  Gel formed of proteglycans filling the basement membrane ECM.

• Reference, in format PMID:
  Reference reviews on basement membrane components: PMID: 21421915, PMID: 28324731
  Reviews on the ECM: PMID: 39223427, PMID:21123617, PMID: 25701227

• Gene product name and ID to be annotated to this term
  AGRN, HSPG2

• Parent term
  Non-collagenous component of basement membrane(NTR Add term Non-collagenous component of basement membrane #29491 , overview Re-organize the child term of extracellular matrix (GO:0031012) #29267 )

• Synonyms (please specify, EXACT, BROAD, NARROW or RELATED)
  None

• Cross-references

• For enzymes, please provide RHEA and/or EC numbers.

• Can also provide MetaCyc, KEGG, Wikipedia, and other links.

• Any other information
  See slides 1 and 11: https://docs.google.com/presentation/d/1zxL0gt5vOynmJsS8BP-Xqs_0sTaEB8Zo/edit?usp=sharing&ouid=109267399050361021326&rtpof=true&sd=true

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Slide screenshots:

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[Matrisome]

@DaiqingChen : please update link to revised slide 11 and add new screenshot